I have a taller tank, which I know is not really needed by my bp but it is not too excessive, anyway I do use a lamp to keep ambient temps up and I have been through three "night-glow" bulbs so far that are dark but give off enough heat to keep the temps up. They run for about $10 each around here so I got fed up after another one quitting and went to a hardware store to see if I could find anything similar.
I bought a bunch of 75 watt black light bulbs for $2 each and they are literally black. No glow is given off at all!! My ambient temp is staying at 84 with one 75 watt black light and foil on my 25 gallon terrarium. Is there any real difference between the bulbs I got at the hardware store and the reptile brand bulbs? I know my bp doesn't need UV.