Quote:
Originally Posted by chong
Best one to use is the T5 Fluorescent lighting for High Bay or HO applications. The light output of these lamps stays relatively flat throughout 95% of its life. They have the same output as HIDs lamps, but HIDs' output tapers down after 50% of it life. T5 Fluorescent lamps are available in "Sunlight", as well as, the usual warm and cool white.
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Sorry but i would have to not agree with t5 having the same output as metal halides,,the t5 bulbs have a much lower PAR than the metal halides bulbs do,,metal halides emmit a much more intense and brighter light spectrum than t5 bulbs do,,,I just know alot about this subject due to having saltwater coral tanks for almost 21 years now..and as we all know saltwater people always know their crap when it comes to lights!! Take care-Jason.
and the metal halides really dont per say tapper off that much their kelvin changes over time with the age of the bulb,,so lets say you bought a 6500 kelvin bulb and burnt it for one year ,,after that one year that kelvin drops,,and the light emmits more of the red spectrum,,so it could be like 4700-5200 kelvin now that its been used for so long,,after about 9 months I notice the bulbs spectrum is alot different than when i first had the bulb when new,,plus I always know when to change the bulbs cause i start getting in my tank alot of undesirable algae!!