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Originally Posted by Invigor
manufacturers are finally getting the hang of high par with more blue colouration out of halides, but you're paying top dollar for a bulb like that. if you want best output for best bang, probe start ballast + XM 10k halides with some NO fluorescent actinic supplimentation is a nice blend and can be had for very cheap.
personally I prefer high color rendering index over "the blue look"..nothing beats a great 10k bulb with a 90+ CRI. it doesn't seem anyone gives a damn about CRI but to me, it makes a HUGE difference in the overall appearance of the tank. the downside is not a lot of mfgs advertise the CRI of their products. the only company I can think of that does, is ushio.
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Iwaski has those PAR bulbs with a CRI of 96 or something crazy. From the looks of it (user reviews and whatnot), these things perform just nearly as 400 watt SE bulbs of X brands.