Most recent revision 10-9-19
With LED Lighting advancing at a fever pace, there is a lot to know and as well there is a lot of good information available, but there is also a lot of bad or simply misleading information too, especially when it pertains to what determines the best LED lighting for a Reef or planted freshwater aquarium.
- PAR (Photosynthetically Active Radiation)
- PUR (AKA Useful Light Energy)
- Other LED Considerations/Rumors
- Unique Features; Lightning Storms to Stimulate Breeding
- In Summary
- TMC AquaRay Recommendations
The picture above provides a simple but accurate depiction of commonly used emitters and how many might be equal in the incorrectly used parameter of PAR, BUT miss the much more important PUR (useful light energy) since many utilize warm white or cool white emitters that have much more lumens of energy in the much lower efficiency PUR useful green & yellow spectrums.
In other words, two lights (or emitters) might be equal in PAR, but the one that primarily emits its light energy in yellow & green or with incorrect spikes in other nanometers bandwidths is going to be INFERIOR as the picture above exemplifies!!
This makes the point of while a PAR reading/measurement is helpful for light within the approximately 400nm – 700nm range, it DOES NOT give an accurate reading of the exacting light bandwidths within the PAR range that is much more important for freshwater plants and light sensitive reef inhabitants!
- The Cree 6500 is from the GroBeam 600
- The Cree Cool White is from the EcoTech Radion
- The Cree Warm White is from the Maxspect Razor
Click on the picture to enlarge.
SO PLEASE READ ON TO UNDERSTAND MORE BEFORE YOU MAKE YOUR PURCHASE OF AN LED AQUARIUM LIGHT!
Lets start with CRI (Color Rendering Index), this is what OUR human eyes see, not necessarily what is best for Corals or Plants.
Unfortunately even some of the best LED manufacturers as well as those reviewing LEDs, such as an otherwise very good Aquatics Blog post I read recently, tend to give way to much credence to the importance of CRI as to Aquarium Lighting.
Please reference: Aquarium Lighting.
Also many who purchase a good LED light will look at their new light and then compare it to an existing T5, Metal Halide, or similar and then complain that the LED is not as bright. This is again based on the fallacy of depending upon the narrow band of light our eyes can see.
Among the few LED’s that do not depend upon CRI ratings, rather with the most accurate essential light energy for Reef or planted aquariums currently on the market include the TMC AquaRay, Kessil or Orphek.
Further Information, Resources:
- AAP AquaRay AquaBeam, GroBeam High PUR LED Aquarium Lighting
- Aquarium LED Light Review, Orphek, More
- LED Comparison Chart
More specific to CRI, many purchasing or reviewing LED or other Aquarium Lights look to CRI as to how their corals or fish look under specific lights, and often those lights with higher CRI will show of certain colors better than other lights.
While this is all well and good, this should not be used other than maybe a minor consideration when purchasing an aquarium light, in particular LEDs.
Many low end LED lights such as the newer Fluval LEDs note CRI, but ignore the vastly more important PUR; WHY? because these lights are of very low quality with emitters daisy chained together and very low PUR.
Back to CRI, freshwater aquarium plants or the symbiotic zooanthellic algae living within corals, clams, etc do not “care” how they look to you, but their biological needs are important when it comes to “Useful Light Energy” (PUR) & and how much PUR is deliveredd to them, so these parameters should be more important to you.
Photosynthetically Active Radiation is the spectral range of solar light from 400 to 700 nanometers (some research indicates up to 750nm) that is needed by plants & symbiotic zooanthellic algae for photosynthesis.
Although LESS important for determining which LED Light to purchase than “Useful Light Energy/PUR” it is still an important to know.
This is found from actinic UVA to near infrared.
The first aspect of PAR is Phototropic response (400-500nm)of which 450-485 has the highest PAR of the blue-actinic range) which is the absorption bandwidth of chlorophylls a, c², and peridinin (the light-harvesting carotenoid, a pigment related to chlorophyll).
The second aspect of PAR is Photosynthetic response followed by Chlorophyll synthesis (620-700nm) which is the red absorption bandwidth of chlorophylls a and c².
Please see this article for more on the subject of PAR:
Aquarium Lighting Facts; PAR
Zooxanthellae are single-celled plants that live in the tissues of animals such as corals, clams, anemones, & nudibranchs.
PUR (AKA: “USEFUL LIGHT ENERGY”) stands for Photosynthetically Useable Radiation.
PUR differs from PAR as the basic definition of PAR is ANY light energy in a specific frequency range (400-700nm).
PUR is the known USABLE light energy portion of PAR, as well different photosynthetic species will have a different PUR range to which they respond, to which research is still behind as per exact wavelengths for many of these species.
It is important to note that an LED (or any light) can test well for PAR using a PAR meter, but still have POOR “Useful Light Energy” (PUR)!!
The Picture to the left is a spectrograph with high PAR Values and high PUR percentages, from a 2012 Cree XR-E 14000k emitter
If using Apogee MQ-200 PAR Meter or similar to test PAR value you can get similar µMol•m²•sec numbers from one LED to another.
A PAR meter can sense and report light (‘photons’ or ‘quanta’) that are responsible for promoting photosynthesis which are the wavelengths that are between 400nm and 700nm.
However, if one of these lights produces energy that peaks at 450nm (the blue spectrum); while another light peaks at 590nm (yellow spectrum); your reading comparison is not all that accurate since the PAR Meter reading will be similar, yet the light producing the exacting 450nm bandwidth is clearly the better light to use, which is where a PAR meter is often over rated!.
As well, PAR meters are less accurate in measuring ANY light energy under 500nm, which is why a one light from the same manufacturer with the same exact energy input that has higher nanometer light energy will have a higher PAR than one that is 450nm despite the same exact actual energy input and output!
Reference: Aquarium Lighting Facts; PAR
For zooxanthellae in your coral’s tissue, the light peaking at 450nm will have greater PUR than the light that peaks at 550nm, although the PAR mmol readings are less for the 450nm light with equal energy consumed.
Thus your PAR meter should be only a part of your light energy measurement determination, otherwise if a PAR meter is all that you use, you could end up with an inferior light!
Similar can be stated about relying on PAR only for a planted freshwater aquarium, especially since many fluorescent lights can be heavy on the yellow/green spectrums which a PAR meter does not differentiate.
This is also a problem with many LEDs that rely on “cool white” emitters, which unfortunately many of even the pricey LED fixtures utilize these less than desirable emitters!
For this reason LED fixtures such as the EcoTech Radion which utilize cool white emitters might have an excellent PAR value, it is going to fall short of others that utilize better daylight emitters in the more important PUR. Worse yet are the Warm White emitters used by Chinese LEDs such as the EverGrwo/Ocean Revive
EcoTech Radion Review
EverGrow & Ocean Revive Review
Based on known data as per Cynobacteria alone, and despite the lack of knowledge of certain particular corals or freshwater plant needs, we do know enough that PUR should be your major consideration.
To set PUR aside, as some arguments have chosen to do, is dishonestly ignoring KNOWN & ESTABLISHED FACTS about lighting and its effects on zooxanthellae, plants, to even humans!
The problem with relying solely on a PAR reading is this does not accurately reflect “useful light energy” output, as well there is more than one way to mix light “colors” (wave lengths) yet still maintain the desired PAR and other popular ‘selling’ parameters (kelvin, etc.); these mixes of colors (often by adjustable LED emitters) are rarely optimum for PUR/Useful Light Energy.
Please read this article which displays emitter spectrographs by simply using a digital camera:
PUR vs PAR in Aquarium Lighting (LED)
In fact as per the gimmick of adjustable LED emitters; Spectral output only holds true when the emitters are run at the operating voltage and current that they were designed for. As soon as that simple voltage rheostat is used (“control technology”) or RGB is altered, the spectral output changes thus lowering PUR.
I should also note, that based on observations by many TRUE aquarium maintenance professionals (not the Hollywood types), even a Spectrograph is not always a reliable source of exact “useful light energy” output as even when spectrographs have displayed similar charts, the results were different.
This may in part be due to the amount of energy actually delivered due to LED circuitry and driver design within each light band.
Unfortunately the VAST MAJORITY of LED Aquarium Lights flooding the market use general LED emitters available to all lighting manufacturers. These emitters are used for all lighting applications from home to industrial use and are NOT specifically designed for aquarium use.
These may require up to 4-5 times the wattage; such as the Boost LED or Blue Moon/TaoTronics LED. These are one in the same LED from the same Chinese manufacturer.
Reference: Blue Moon/TaoTronics, Review
These may produce similar results in PAR, but NOT PUR as the better patented emitters such as the exclusive CRee & Osram Olson emitters used by Tropic Marine Centre’s AquaRay LED or the Orphek LED.
The end result is while certainly reef capable, these LEDs require 120 watts of electricity to do the job a better fixture can do with 30 watts (part of the reason of higher input wattage is the use of extreme energy wasting current reduction technology, which wastes considerable amounts of energy as heat).
As per “Useful Light Energy” (PUR), I will address a comment that attempted to insist that “there is little difference in emitters” between those use by TMC, Orphek and other high end LEDs using patented emitters and those used by Marineland and others using “off the shelf” emitters.
To make such a rash comment ignores the expense of development and technology of the emitter, as well as drivers and circuitry running the emitters. This displays about much sense as comparing a processor running a computer circa 1995 as a processor running a 2013 computer.
For those who believe this type of BS or want to make such comments, go ahead and hang multiple LED flashlights you can purchase at Walmart for $5 over your aquarium and see how well your Reef inhabitants or freshwater plants thrive!!
While the above is an extreme analogy, as emitters used by LEDs such as Taotronics, Evergrow, etc. are certainly not this bad, they still are not of the exacting spectrum of the patented emitters since these and most other aquarium manufacturers used common “binned” emitters.
Cree & Osram Olson are recognized as the leaders in LED emitter technology and development; and even within specific emitter bins such as the well known XR-E emitter, these emitters are constantly upgraded with patents to these upgrades.
As an example (again using the XR-E), the XR-E emitter bin utilized two years ago is not the same patented XR-E purchased today. The newest emitter “updates” are kept exclusive by contract so one cannot purchase a Chinese LED fixture such as the popular E.Shine advertising an XP-G, XP-E, XR-E, etc. and expect the exact same emitter as one from a fixture that has exclusive rights to the newest developments, including the newer yet XT-E, XB-D, & ML-E emitters.
As an example of how this works, especially since this is a major area of confusion:
What many do not realize is that the aquarium lighting aspect of LED emitters is but a needle in a haystack as per emitter sales for companies such as Cree. So most of what is offered are standard emitter bins in Kelvin colors such as “warm white & “cool white”.
What has happened with the patented emitters such as the XT-E used by TMC AquaRay, is these emitters have been modified to more efficient colors such as 10K daylight, THUS REQUIRING LESS EMITTERS since there is less than a shotgun approach and therefore lower input electrical wattage.
Does this mean a new XT-E emitter used by EcoTech is BAD?
Certainly not, but as the graph at the beginning of the article illustrates, the common binned version does not compare to the patented version; these are FACTS that cannot be disputed!
As well Osram Olson has an emitter that was paid by TMC to be developed exclusively for the use in reef aquariums (the NP full reef spectrum blue).
This also includes the fact that most LEDs control their emitters with “Current Reduction” instead of the vastly superior “Pulse Width Modulation” with the end result of less than optimum PUR and excess heat generated.
Please reference: http://aquarium-digest.com/2010/04/11/led-aquarium-lights-lighting/#pwm
As a final thought here, keep in mind that a high end LED Light fixture is an electronic piece of equipment that is in part only as good as its drivers and circuitry which is also why care must be given in the installation to protect against humidity or moisture damage.
Below is a picture of a reef aquarium containing acropora corals that has been running for 6 months as of the time of this picture with VERY high PUR but lower wattage (lower carbon footprint too) AquaRay/ AquaBeam NP 1500 and 2000 LED tiles ONLY!
This picture is from my other article:
Acropora Coral Information and Care; Lighting, Amino Acids, more
Other LED Considerations/Rumors
I look at areas where fiction & facts often get obscured either by poorly worded reviews, very often inaccurate forum posts, and manufacturer claims.
- Drivers/Circuitry: What an emitter diode produces depends entirely on the power being received, which depends entirely on power supply and drivers! The results of a poor driver is an unreliable PUR which is the sad fact of many LED fixtures!!
The FACTS are most LED fixtures contain mediocre internal electronics essential for cost savings (you get what you pay for)
- First, many confuse the importance of dimming LEDs for sunrise and sunset. Having dimable features does not make an LED bad (as some claim), but neither does this feature make a LED better as others claim.
It is also noteworthy that very few LED Fixtures use “pulse width modulation” rather most utilize “current reduction” which is inferior for retaining light spectrum quality across all emitters!!
The bottom line is this feature is for the aquarium keepers benefit, so if you like this feature great. However if not fine too, but do not let this feature make you purchase a lessor LED if the better LED Fixture does not have this feature.
- CRI, I already addressed this earlier, so I will only add that this again is primarily for your benefit as an aquarium keeper, not your corals, etc.
- Moon Lighting; Moonlight is not Blue, so do not purchase a LED fixture for this reason only (meaning one LED fixture provides a blue moonlite phase while brand 2 has a dimmed full spectrum phase)
Please reference: http://www.fish-as-pets.com/2010/09/aquarium-moon-lights.html
A couple of LEDs I would recommend is the vast TMC AquaRay Line of LEDs or the Deep Tank Orphek LEDs (which are currently difficult to obtain)
Be careful of purchasing brands such as the MarineLand Single/Double Bright, Ecoxotic, Maxspect, and many others as many of these lights simply do not have the best emitters as per PUR or in one companies case, infringe on patents.
For example the Ecoxotic depends upon (12) 1 Watt LED low end technology emitters versus (5) 2.4 watt very exacting wave length emitters for the TMC AquaBeam 500/600 (the 8000k white emitters use by Ecoxotic are not nearly as exacting as the patented & exclusive CRee 14,000k emitters used by the TMC AquaBeam/AquaRay); the result is although the Ecoxotic may cost 40% less, your useful energy (aka PUR) is less than 1/3 that of the TMC AquaBeam 500/600s.
Is this really bargain?
Please reference: http://aquarium-digest.com/2010/06/30/led-light-review-tmc-xg-1500-maxspect-more/#ecoxotic
Unique Features; Lightning Storms
Another unique feature that some high end LED Aquarium Lights can perform is simulated lighting storms.
With the TMC Storm Feature and Multi Power Controller, an aquarium keeper can simulate lightning storms via an internal program that will last 30 minutes.
See: AAP AquaRay Controllers
This feature when utilized immediately after a water change is a proven way to stimulate many Tropical Freshwater Fish and certain marine fish species to breed.
It is now obvious in reading this article which aquarium LED brand is my preference, based on the science of lighting, as well as my use, and also as per the many I know in the industry who have used many different Aquarium LEDs, many with with good results.
So now I will point out another reason why I am sold on the TMC line; WARRANTIES and customer service.
TMC warranties their LED fixtures for 5 years, as compared to 1 or two years for most other brands. One brand, “Finnex” originally had a 180 day warranty, these are a joke in my opinion!
Why is this important? Well since almost ALL other brands utilize “current reduction” and thus require cooling fans, these are a part that often breaks down, and there are even reports from some of my friends who own different LED fixtures with cooling fans that their unit even caught on fire when it over heated!!!
Since most of these companies do not have a long warranty, you could be stuck.
As well a few friends who returned their LEDs under warranty had to wait a few weeks for the repair to be made while their tank was missing an important light.
This is why, more than any other reason I prefer TMC, as I and others have used other brands with success, albeit with much more energy usage for the same results, nothing beats TMC for their customer service for a rare break down.
One friend who works for a retailer that sells AquaRay, told me that the vast majority of returns turn out to be products that were abused and had clear damage from this misuse.
HOWEVER they told me that even 3 years into the warranty they were authorized to give the customer a NEW LED fixture at no additional cost, not wait for a repair!!
This to me is incredible, as I have had other electronics break down such as a lap top computer and still had to wait a few weeks for the repair, they did not simply ship me a new laptop!
When the most important factors are considered, which this article only gives a brief ‘overview’ of (an in depth reading of Aquarium Lighting; Facts & Information is a must), the truly high end LED Aquarium Lights, of which there are currently just a few requiring only .6 (maybe .8) watt per gallon for high light freshwater planted aquariums and just .8 (maybe 1) watt per gallon for most Reef Aquariums. Of coarse this is a simplification and depth, specimen placement, etc. are also considerations.
For “FISH ONLY” of very basic planted or FOWLR marine tanks, only 1/3 to 1/2 the above watts per gallon are required.
Please note that there are many other variables such as specimen placement, tank depth, light placement that can increase or decrease these suggested wattages; Ex: a shallow tank (such as only 12 inches deep) that might be large in volume will require lower wattages of “high end” LED light energy.
These watts per gallons aquarium lighting requirements must be compared apples to apples as these watts requirements do not apply to most Aquarium LEDs as most are just cheap Chinese imitations utilizing older emitter bins without proper drivers/circuitry.
If you are still considering one of these LED knock-offs (that use “off the shelf emitters”), realize the most important light measurement is “Useful Light Energy” or PUR and although many lighting professionals recommend the use of PAR Meters as a measurement of any aquarium lighting fixture, in the end this is far from 100% accurate, especially when one compares the patented emitter bins to the standard emitter bins used by the cheaper Chinese or similar LED light fixtures.
Often the “cheap” LEDs produce considerably more much less efficient green/yellow light and are bottom heavy in the Blue Spectrum. It is also noteworthy that a couple of these low price LED makers from China are also using stolen technology emitters and pending lawsuits will likely result in these manufacturers not being around long term for any real customer support.
Another company keeps coming out with awesome controller “bells and whistles”, yet still uses “off the shelf” cool white, red, and green emitters along with current reduction technology that wastes energy as HEAT that that could be going to lighting your aquarium.
While these controller features are certainly impressive, when one does some honest homework, it still comes down to “useful light energy” and these emitters are clearly not the best for this.
That said, do not buy ANY LED for controller features, but for light energy produced. This includes TMC for their “storm feature”, which although it is cool and somewhat useful for some advanced aquarium keepers, the ONLY real reason to spend the amount of money an LED fixture costs is for LIGHT. So why not purchase your LED for actual lighting to keep your freshwater plants or coral reefs???
So consider whether your so-called “deal” of a LED Light is really a deal at all or look at it this way: would you use multiple LED Flashlights you can purchase at Home Depot or similar to light your Reef or planted Aquarium? Although this analogy may seem a bit exaggerated, it is still a reasonable analogy when one considers current technology advances and the costs of developing these advances.
In other words you may save some money up front, but long term you will use more electricity for a fixture with a 1 year warranty that if you are lucky might last 2 years versus a fixture guaranteed to last 5 years.
As well during the time you are running one of the fixtures that require a higher wattage to get the job done, your Carbon Footprint is going to be considerably higher!!
In the next section I provide actual LED recommendations based on the TMC AquaRay line of Aquarium Fixtures.
Some jaded persons may think I work for TMC; well I do not; I simply have found their LED lights the most assessable, with the most variable applications, with the among the best science and recommendations from my aquarium service professional friends to back them up, along with excellent customer service when problems did arise once (at least where I have purchased my LEDs), and finally with fair pricing when I consider that these are very high end “Cutting Edge Technology” aquarium light fixtures.
See: Customer Service
I will also state that my friends who maintain and design aquariums professionally primarily use this line of LEDs (based on results), which their input and research is my primary reason for this article and use.
Here is a very basic RSM 250, 65 gallon Aquarium with AquaBeam Reef White LEDs YouTube Video”
YouTube Video; RSM 250 with AquaRay 600 Reef White
TMC AQUARAY RECOMMENDATIONS
This is where I have generally purchased My LED Lights from:
AQUARAY LED AQUARIUM LIGHTS, LIGHTING; at American Aquarium
First understand the differences between the emitters and drivers used:
The Newest emitters:
*The Cree XT-E, XB-D, & ML-E, along with the Osram Olson “NP full spectrum Blue” (“Nature Perfect”) emitters are the newest yet.
The Osram Olson ‘NP full spectrum Blue’ is an emitter specifically designed for Aquarium Reef use in its PUR output.
The new Cree patented emitters promise to be a much less voltage sensitive emitter, allowing got better adaptation to the harsh aquatic environment.
In the blue spectrum, the ML-E Blue is generally used as a focused (lensed) emitter & therefore a deeper penetrating, High Kelvin 465-485nm “royal blue”.
The ML-E Blue can compliment other LED lights of 14,000 or less.
The new patented XT-E is used in the Fiji Blue are 420-465 nm, this emitter enhances the fluorescence of the corals. These are unlensed, and therefore are not quite as deep in penetrating as the ML-E blue, despite there lower kelvin.
Should you decide on the high end TMC AquaRay Lights, here are some considerations among the LED fixtures TMC offers;
*AquaBeam 600: Each 600 Fixture has a 24 x 11 inch light spread that penetrates well to 20 inches, good to 24 inches and fair to 30 inches (not recommended past 30 inches).
In deeper tanks such as though between 22-30 inches I recommend the #600s to add more light spread to compliment the more focused Reef White or Marine White 1000 Ultras.
See: AquaRay 600 Ultima
*The GroBeam 600 is suggested for planted and most freshwater applications.
*The Marine White 600 is best for fish only marine applications and blended with Marine or Reef Blue as well as any actinic T5 or similar lights already present. As well, the Marine White (in particular the 1000 Ultra) is an excellent compliment to the GroBeam in planted freshwater aquariums over 24 inches in depth (generally in a 3 GroBeam to 1 Marine White configuration).
*The Reef White (18K) is generally the best overall Reef LED in the 600 strips
*The Marine Blue (20K) is a good mix with other lower kelvin daylight bulbs or for deeper tanks (often in combination with Reef White)
*The Reef Blue is NOT a complete light for proper/full PAR/PUR in photosynthetic invertebrates, so this LED is meant as a compliment to other daylight LEDs or other daylight lamps such as a T2 or T5 daylight. The Reef Blue (as well as the Marine Blue) is also useful in tanks up to 30 inches for to compliment lower kelvin daylight in light penetration.
*TMC Mini 400 & 500:
*Each Mini 400 has a 15 x 15 inch light spread that penetrates well to 18 inches in freshwater.
Excellent for high light planted Nano aquariums (15 gallons or less, including small hex aquariums), as well the unique shimmer effect looks very nice with this newest offering by TMC
*Each Mini 500 has a 15 x 15 inch light spread that penetrates well to 18 inches in saltwater
Similar to the 400; excellent for Reef Nano aquariums (15 gallons or less, including small hex aquariums) for all but the most demanding reef life (which further test may yet prove OK for as well)
The Mini 500 includes 4 lensed CRee patented XP-E 10,000K and one unlensed Blue CRee XP-E. with a unique switch to control off & on, blue only, or all.
The Picture shows a Mini 400 mounted using a MountaRay bracket and head on view of the Mini 500 Reef, Marine Aquarium LED.
See: AAP Mini 400 LED Light Tile
*GroBeam 1500: Each GroBeam 1500 has a 24 x 24 inch light spread that penetrates well to 24 inches in freshwater (A Marine White would make a good compliment for tanks 24-30″ in depth in a 3 GroBeam to 1 Marine White configuration).
This is their best planted aquarium light BAR NONE with the most useful energy per square inch within the footprint!
Do not believe a certain unscrupulous live plant aquarium retailer that bad mouths these LED fixtures and has likely never used these lights.
As well, this person continues to push older technology inferior T5 lights; the FACTS are the GroBeam 1500 (& 600) is THE BEST freshwater planted aquarium light, period with the science to back it up!!
This light has been proven by so many to not only grow freshwater plants, but make plants thrive and explode in growth, their are many articles and aquarium forums documenting this!
Suggested Forum: Everything Aquatic Aquarium Forum
*Colour Plus 1500 (both AquaGro & Coral Colour): This is an excellent light for making fish, plant, and other colors “pop”
Excellent for medium to high light planted aquariums by itself and as a supplement to the GroBeam.
The Coral Colour Plus version contains the patented NP Blue as well as UVA emitters for advanced reef tanks.
Similar to the EcoTech Radion, except with less blue, which makes it a better choice for freshwater, although by itself a lower choice for reef tanks. HOWEVER this light exceeds the EcoTech Radion in that it utilizes newer generation XG emitters and more importantly does NOT use “cool white” as does the EcoTech, rather it utilizes 9000K Daylight emitters.
*Reef White 2000:
Each AquaBeam 2000 Ultima has a 20 x 20 inch light spread that penetrates well to 30 inches in saltwater (& freshwater for certain applications).
The Reef White is the best LED for deeper applications or to compliment other LEDs for very delicate reef specimens such as Maxima Clams.
As well the Reef White 2000 Ultima is a good compliment to Marine Blue, Fiji Blue or Reef Blue 600s in deeper tanks.
*AquaBeam 1500 Ultima; Ocean Blue 20k:
The same emitters as the Reef White 2000, but the emitters are unlensed.
Each Ocean Blue NP Ultima 1500 Tile (20K) has a 24 x 24 inch light spread that penetrates well to 20 and maybe 24 inches in saltwater (& some freshwater applications).
This new LED fixture contains these emitters; (2) x Cree Patented XT-E Fiji Blue, (4) x Cree Patented XT-E Ocean White, and (4) x Osram Olson NP Blue.
Best results with these fixtures is for specimen placement under 15 inches (22 inches max), however the NP Ocean Blue 1500 can be mixed with the Ultra 1000 LED fixture for tanks much over 22 inches in specimen light placement
The Ocean Blue NP 1500 is excellent for use in most shallow Coral Frag Tanks, since these are unlensed emitters, resulting more light spread but less depth penetration
Ocean Blue 1500
As with ANY aquarium light, placement of your freshwater plants, sps corals, maxima clams, etc. can make a major difference in the amount or number of light fixtures required.
I know of many who have kept reef specimens and aquatic plants with half the recommendations I have made here. In these aquariums the plants or corals were placed directly under the lights with the entire tank simply not 100% lit.
An example is a friend with just one GroBeam #500 in a 40 gallon aquarium with live plants that are thriving and growing (this tank is actually well lit with just one GroBeam, but the plants are directly under the 24 x 11 inch footprint of lighting).
OTHER WEBSITES OF INTEREST: