do ceramic lights (like one made by ZooMed Ceramic Heat Emitters ) actually give off light? I'm looking for a heating system that does not emit light (undertank heaters aren't getting hot enough for my tank) I have a 15 gallon, what wattage/volt would you guys get for a 15 gallon?
http://www.petsmart.com/global/product_detail.jsp?PRODUCTprd_id=845524441780335&FOLDERfolder_id=2534374302030050&ASSORTMENTast_id=2534374302023694&bmUID=1097728588442
here's what one ceramic light looks like

