I tend to agree, as I use black or red bulbs at night in the winter for some of my snakes (as supplemental heating- they ALL have UTH anyway), & if they didn't like that dim light, I don't think they'd keep basking & sleeping under them as they do, but they go out of their way & appear to enjoy them.My bulbs are 40-60 watts, & all are dimmed way down- they'd be way too hot otherwise.