Best bet is to contact Bob Pound at Pro Products. He is Mr. Heat Panel and can help you out. Super nice guy too... www.pro-products.com
Agreed, I use heat panels in two of my cages and couldn't be happier, Bob is an awesome gentleman to buy from.
I highly recommend these panels.
Mike
"They are biting out of excessive fear, not because they are mean. Mean is a human emotion and serves no purpose in the animal kingdom" - Kevin McCurley-The Complete Ball Python
I hate to make this sound like a Bob Pound love fest but I have bought four panels from him. He's always willing to chat, will spend whatever time is necessary to help you with your purchase and takes care of his customers.
.....oh yeah - the panels are an excellent product too.