Faequine, if you get a thermostat, you can regulate the amount of heat the bulb emits so that you won't burn Greg. Still, don't put it directly on glass--as ICULIZARD says, the glass will shatter from the heat.
There are thermostats and regulation systems for day-night regulation of herps' environments--you tell the system what temps to maintain and it does all the work. I myself am using a Zilla Power Center, digital, with two Reptitemp 500R thermostats to regulate the heat and light on my BP's enclosure. However, Mykee has recommended another brand as being better:
Herpstats by Spyder Robotics:
Spyder Robotics Herpstat