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Re: lighting

IMHO, intensity is far more important than the light spectrum. With this 
in mind I have always gone with the cheapest lights possible... basic 
cool-white fluorescent bulbs. When working in the lab I have maintained 2 
day doubling times with just these bulbs (though at a fairly high 
intensity). If you are on a tight budget, there is no need for anything else.
OTOH, more expensive bulbs will deliver higher lumens per watt, perhaps a 
more usable light spectrum, and may even last longer... so in the long run 
which is cheaper?