>>Do you just use cool white or a mixture of cool and warm? I think the combination better covers the spectrum, but have not tried just cool so dont know the significance.<< I use whatever is on sale or cheapest. I go more for economics then scientific for equipment. Never made any comparisons on bulbs except for the "grow lights". ======================================================= Uncle Steve's Hot Stuff 1998 product list is available by auto response Email to: mailto:hot.chiles@usa.net =======================================================