Because the 100 watt is providing heat. But you need the UVB aimed at the same area to provide the UVB rays that the 100 regular bulb does not provide.
They will bask for the heat, which the UVB bulb does not provide. If he was in the sun or under a mercury vapor light, he'd get both the heat and UVB and UVA rays.
"You become responsible, forever, for what you have tamed." -Antoine de Saint Exupery-
Posted: Mon Mar 13, 2006 8:25 pm Is This Unsual