I'm doing the same one as you. You shouldn't (I don't think) have to cool the bulb down between experiments. If you start by using a low voltage (thus low power), the lamp won't heat up as much as when you use a higher voltage.
And i was wondering if you could help me! I can't find a site in...
You guys are lucky! For some reason, my head of physics decided it would be a great idea for me to resit my waves/practical paper even though I got a B, so not only do I have to do this one, but I have to do the A2 one as well! And you know what? The A2 one looks so much nicer than this one...