Actinic White 12,000K T5 Fluorescent Aquarium Lamps by UV Lighting Co. The combination of 50% 420nm and 50% triband phosphors makes this the lamp great for coral, live rock and related marine life. The 12,000 Kelvin temperature peak gives the Actinic White a true daylight spectrum. URI has established itself as the hobby favorite with their popular VHO lamps and now they're continuing this with their T5 line. T5 lamps are unmatched in their output and intensity due their reflective possibilities. Their small diameter (compared to other fluorescent lamps) allows manufactures to create parabolic reflectors that are extremely efficient. These lamps are the future of fluorescent technology. Whether you use them as supplementation with metal halide or stand alone they are sure to impress. The URI actinic white VHO bulb is the first of its kind to offer a 50/50 combination of triband and actinic phosphors. Actinic white is a high performance upgrade, great for coral, live rock, and related marine life. *Important Shipping Information: Minimum order of 2 (two) T5 lamps, (Mix & Match), to qualify for our standard shipping fees.