Arcadia marine purple complements the white and blue lights in your marine aquarium it is perfect for salt water habitats showing off your fish crabs and coralsr the marine purple is a t5 lamp which gives it several advantages over the older t8 tubesr r the t5 is 40 smaller in size so can physically fit in more in the same spacer the t5 has a better light spectrumr the t5 has a higher luminance surface brightness of the lampr the t5 has reduced power consumption due to the improved lum