LED and T2 Aquarium Lights

LED and T2 Aquarium Lights for Freshwater and Marine Reef Tanks
The LED and T2 as of this post are probably the best two aquarium lights in terms of output of useful light energy per watts used

Although the popularity of these two lights is still lagging many other lights used by aquarium hobbyists, hopefully the facts of these two styles will get out to many who will find these to be useful for marine reef and freshwater plant tanks in particular.

Both these lights still have much misunderstanding (along with the other excellent light that is popular in greenhouses, but is still sadly not well known in the aquarium hobby/industry; the SHO).
In the case of the LED, many still cannot get past the watts per gallon rule of thumb that is badly outdated, as well the other aspect that slows the popularity is cost which is certainly more understandable, however when one considers the 50,000 hour lifespan and the operating costs that are generally 1/3 or less of many popular CFLs, this is not truly the barrier it is often made out to be (although up front costs to acquire many of the better LED Systems such as the “Top of the Line” TMC Aqua Ray LED Aquarium Lights certainly can still be hurdle for those on a budget).
This is where the newest generation T2 light systems shine as although the output per energy used is not to the level of an LED, it is an improvement over the still excellent but lower output per watts used T5 lights, as well the T2 is a considerable improvement over many CFLs and more so yet over standard T8 and T12 lights. The advantage of the T2 is price with many of the fixtures priced around $30 usd. (as compared to the $150 usd plus for the better LED systems)

What sets these Lights Apart from others?

First, I would suggest that readers reference this excellent a well researched article (as this Fish as Pets post is but an abbreviated summary):
Aquarium Lighting; Information, Facts

Here are some important points to consider rather than the old watts per gallon “rule” only:
• Watts per gallon,
• Lumens per watt, PAR (often easiest determined by Kelvin output),
• Lumen focus
• PAR
• Useful Light Energy (not wasted in yellow/green spectrum that plants and zooanthellic algae reflect)
• Output in relation to bulb length (this is where T2 and Power Compacts excel).
• Lux

The first five are the most important, and as well it is noteworthy that watts per gallon is still a consideration, it is at best ¼ of what determines a proper aquarium light for a given aquarium. With this under consideration one modern LED such as the TMC Aqua Ray LED 12 Watt Aquarium Light Fixtures can produce more useful light energy necessary for live freshwater plants or marine reefs than one older generation T8 or T12 Trichromatic Fluorescent of 20 watts by 4-5 times.
Even modern CFLs require about three times the wattage to produce the same amount of useful light energy.

When it comes to T2 Aquarium Lights, although they still fall short of an LED, these lights still have one of the highest lumens per watt outputs and still produce less yellow/green spectrum light energy than many others. As well the purchase price is low, plus they generally last about 10,000 compared to the 8,000 hours of most other fluorescent lights and are available in the most important Kelvin temperature for optimum PAR; 6400 K.
The only short coming of T2s is for larger aquariums it make take too many of the T2 Fixtures and in this case a SHO or T5 lights may be more practical.

However the T2 is quite adaptable and multiple fixtures can be linked together so as to require only one outlet and even for larger aquariums such as a fish only freshwater aquarium, two 13 watt T2 fixtures can easily provide enough light for a 60, 75 and even a 5 foot 100 gallon aquarium for a n excellent savings of energy over standard aquarium lights.

See the comparisons of different lights to pictorially explain these lights:
Please click on Pictures to enlarge

This picture shows the visible light of a 13 Watt T2 with two 15 Watt CFLs (both are 6400K):


This picture demonstrates one of the strengths of an new technology LED Light (Aqua Ray) using a special camera lens;
On the left is one daylight LED (12 Watts).
On the right is two daylight CFL (totaling 30 watts)
Besides the noticeable higher light output with lower watts, the filter on this camera shows the increase of yellow/green light which is useless to most green plants and zooanthellic algae.


Conclusion

Sadly when I read many aquarium forums, especially Yahoo Answers (which should be avoided like the plague by those desiring factual aquarium information), Many still slam LED lights as impractical and overly expensive.
As well many have not even heard of T2 lights (or even SHO), even though the rest of the industrial lighting world has.