i was doing a little more research on that brand of MVB.
is that what you have?
is it the 100watt?
inside the bulb there are two elements; one regualr and one mercury filled tube. when the bulb kicks on the regular element starts putting off heat, light and some UVA. after about 5 minutes the Mercury gets hot enough to vaporize and complete some sort of circut. after that happens, the bulb changes its light output and starts giving off UV-B.
ive heard that 100watt MVBs in general dont work so well. something about they dont get hot enough to fully activate the mercury.
if its just a light beieng used to illuminate a parking lot or driveway then that wouldnt really matter.
but if raising reptiles, your counting on that mercury to fully vaporize and creat the bluish glow those bulbs are asociated with. then youd want to make sure its not just hot and brite, but produces healthy amounts of UV-A and UV-B.
now like i said, i dont know a whole lot about MVBs, im relatively new to them. all ive heard is that 100watts isnt enough to full get the mercury going.
that could be wrong. i just wanted to give you any info i could find on the matter. hope it was usefull in some way :wink: .