Ok guys, I'm lost now. I've purchased the 75 watt reptile basking bulbs for my little guy. I can imagine that it'll up my electric bill substantially being that it's on all day. I've been reading mixed reviews on whether or not you can also use just a everyday house bulb. Is this safe and/or effective?? If so, what's the comparable wattage required compared to the 75 watt basking bulb?