So over the course of the next couple of weeks I will be setting up many individual enclosures, all involving there own heat source. Obviously finances comes into play and I would like to save money but at the same time get the optimum quality for my animals. With that said I was wondering if anyone had ever used a regular, clear 75 watt bulb as a heat source. These can be purchased alot cheaper then the 75 watt bulbs you'd buy at a pet store. Will they emit the same amount of heat? Also I was wondering about the new energy efficient bulbs? With 20+ enclosures going 12 hours a day, it would be nice if I could opt for these, save some on my monthly electric bill, help the environment and only have to replace them every 4 years. That is if these type of bulbs emit heat. Thanks for your input!