I've used MVB [ mercury vapor bulbs ] , they are controversial because some people feel that their dragon avoids it but mine basked at 12=16" depending on what the wattage is. For an 80-100 or 125 watt I kept it around 12", no closer. For a 160 I'd keep it 16-18".
I've never used metal halide.
It's worth mentioning that all of my beardies were partly raised in the sun, spending many hours outside each week during the warm months so they had the best uvb outside of course.
I've never used metal halide.
It's worth mentioning that all of my beardies were partly raised in the sun, spending many hours outside each week during the warm months so they had the best uvb outside of course.