As the left photo shows, a 3 x CR-30 lighting system has been builded for testing the feasibility of multiple ComboRay units being applied to real tanks. Unlike the usual T5 lamps with tubes of fixed light spectrum, each ComboRay unit can be considered as a spectrum-changeable light to replace the T5 or T8 tubes for either white light or actinic light source. Users can adjust the light spectrum freely by choosing LEDs required to accommodate the light to their own tanks. Like this 3 x CR-30 combo-system, the main light source in the middle is composed of 3 x CW and 3 x NW to provide not only suitable light intensity but also sufficient yellow to red light distribution. With regard to the two actinic lights at two sides, they are composed of 420, 450 and 470nm LEDs which can be interlaced to obtain a even light mixing with the main light in the middle. This combo-system is certainly the best lighting choice for most tanks. In our opinion, this system could be a great option for frag tanks which don't need too intense light but require suitable and/or correct light spectrum for coral coloration and growth. For deeper tanks (depth>60cm, 24"), the installation of 60 degree optical lenses will allow the light to penetrate deeper. With the 30cm x 30cm x 2.5cm (12"x12"x1") slim appearance, it will certainly make your aquariums a different look from what they were used to be.