Ma qual'e' il tuo problema? Emette comunque piu' UVB dei tubi e delle compatte
Da un forum USA sui Tegu

Alright so got my new solar meter 6.2 ,new solar glo 160 watt.So i started to test the 160 watt solar glo uvb bulb and it was warmed up,but i started my first measurement below at 12'' threw 24''.
12''-118mw
16''-65mw
18''47mw
20''37mw
24''26mw
So from what i'm guessing you have to the bulb anywere from 12'' to 16'' to really get a good amount of uvb,they say 50-250 uW/cm2 mimics the natural environment enough to keep your UV-dependent BASKING reptiles healthy.

Ciao