Iguana behavior change

Question
I've recently noticed a change in my older iguana, I have two. My UV litebulb has been out for about 3 weeks...just haven't had time to go buy new one. Are ig affected by not having the UV lite?seasons? or by moving (homes)? He is not eating like he used to, stays in corners alone, and I did notice his skin color looks a little browner he's not as green anymore.

Answer
Hello Jess,

What type & brand of UVB are you using a fluorescent tube bulb or a compact/coil light?
Iguanas can be affected by the seasons & light yes.  They should not really brumate though.  
Do you use an calcium supplementation for him & if so, how often?
What are the temperatures in the tank, & what type of thermometer are you using?  A stick on type, a digital probe or a temp gun?
How old are they?  How old is the male who is not doing very well?

Tracie