Wave point Ultra Growth Wave 39 watt 4 pack of high quality versatile high output T-5 lamp which is a universal replacement lamp for industry standard high output T-5 light fixtures. Wave-points Ultra growth lamps will emit the energy needed for plants and corals. This bulb has two nanometer peaks the first between 400-530 nm which promotes vegetate growth this range of light includes violet, blue and green bands where peak absorption by chlorophyll occurs. The second 600-720 nm the bulb peaking at 660 nm which promotes flowering and budding. This red band is creates a large amount of absorption by chlorophyll and has a significant influence on photosynthesis. For use: Saltwater, reef, planted, freshwater aquariums and hydroponics.