First off sorry for all the questions just want to do what's right for my iguana. Well I noticed yesterday when I was taking some temp readings my power sun light by zoo meds 100watt was making a humming noise. Is this normal? The bulb is only maybe 2 months old. Anyways I removed it and put in a 100 watt zoo med basking bulb no humm now. Now other issue is my temp has gone up in basking spot. As much as 10 degree higher. Was right at 90 to 91 now at 100. Basking spot is 14 inches from light. Now he did seem to bask today but always off to side of light. Now I do have also have a zilla t8 tropical 25 fluorescent 24 inch bulb in enclosure. I was thinking to just return power sun and stick to basking bulbs with fluorescent tube good or bad idea? Then get a 75 watt basking bulb? His enclosure is 4ft long by 2 feet deep by 4 feet tall. Thanks for all your help.