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ATI 48" Aqualblue Special T5 Bulb - 54W Radium 400watt SE 20000K Bulb Large Particle Lignite Activated Aquarium Carbon - GAC - 32oz
Aquablue Special
The Aquablue Special is the closest ATI comes to a full spectrum T5 bulb. Unlike most full spectrum T5’s, the Aquablue Special’s spectrum is blue heavy with highlights at the 550nm green peak as well as a 640nm red peak.
The German-made Radium 20,000K bulb is a legend in the reefkeeping hobby.  You will not have to look very hard to find a legion of reef aquarists that swear by this bulb.  For decades this bulb illuminated some of the most incredible show tanks in the world.  This metal halide bulb is the perfect blend of intensity and aesthetics with a long track record of promoting coral growth and color. Activated Carbon is a chemical filtration media that is very well suited to remove dissolved organic compounds. Regular use of activated carbon will keep your water looking crystal clear and free from any foul odors.
ATI 48" True Actinic T5 Bulb -54W Threaded Bulkhead Suction Screen 1-1/2" Black ATI 48" Power Module 3x75W LED And 4x54W T5
True Actinic
The ATI True Actinic has a very unique spectral profile compared to the other offerings by ATI. The True Actinic possesses an enormous curve that peaks at around 430nm. The human eye does not see this spectrum of light very well, so this bulb looks visibly dim compared to the others.
Bulkhead suction screens prevent livestock and other tank inhabitants from getting sucked into the pumps and plumbing.
These fittings are threaded into standard bulkheads with threaded ends.
The ATI Power module is a hybrid lighting system that combines high-end T5 lighting with LED's for the greatest flexibility in color, intensity, and spectrum.  This is a no-compromise fixture for reef aquarists looking to build the ultimate system.  The build quality of this fixture truly is a cut above.  It is heavy and substantial.  In addition to the material quality, the design is well thought out and intuitive.  For example, there is only one cord exiting from the unit to the controller, which is remarkable for a fixture with the number of independently controllable lights as the ATI Power module has.