Picture shown is Odyssea 36w Power Compact Fluorecsent Bulb DESCRIPTION: 460nm Actinic Ideal for marine/ reef aquariums, and Africa cichlids. 460nm spectral energy distribution closely assign with the blue chlorophyll adsorption peak utilized in photosynthesis. Promote growth of organisms essential for the health of corals, invertebrates. 12,OOOK Premium Daylight Enhance the colors of tropical fish and marine fish. High intensity, purified daylight promotes healthy fresh plant growth and promotes growth of algae essential for the health of photosynthetic corals and invertebrates. Combo(50/50) Full spectrum light enhance color and clarity while providing tank inhabitants with the proper light required for essential biochemical reaction. 50% daylight and 50% Actinic. ODYSSEA's other CF bulbs: Wattages Length Color 18W 9" 10000K Daylight 18W 9" True Actinic 18W 9" Combo (50/50) 24W 13" 10000K Daylight 24W 13" True Actinic 24W 13" Combo (50/50) 36W 16" 10000K Daylight 36W 16" True Actinic 36W 16" Combo (50/50) 65W 21" 6400K Plant Daylight 65W 21" 12000K Daylight 65W 21" True Actinic 65W 21" Combo (50/50) 96W 34" 6400K Plant Daylight 96W 34" 12000K Daylight 96W 34" True Actinic 96W 34" Combo (50/50)