The UVB will not cause this. It sounds like possibly dehydration. Give 20 minute daily baths and when you feed the greens soak them good with water. Also is your pooper eating? Sometimes when they don't eat they loose some mass. What are your temps and how are you measuring them and also UVB?
When life closes 1 door, a new window will open up- R.I.P. dad you are dearly missed and will always be loved....... USMC- Until we meet again!!!!!!
R.I.P. my Cali girl.-3-19-13- You will forever be in our hearts, minds and souls. We now know you are resting on dads shoulder. XOXOXOXOXOXOXOXOXOX