waytoomany.com has a video showing how to make and use one in the weed section, waytoomany.com

actually, here, http://www.waytoomany.com/vids/weed/homemadevap.php

But yeah. Light bulb vapes are definitely neat.

I'm not too worried about chemicals, I'm pretty sure thats why you put the salt in it and swish it around so that it becomes clear. They work great too, like, I was a bit sketchy about it at first...but after I got high after half of .1g I was a believer!

Only thing is...when I do it, I burn the weed. Sometimes it even cherrys on me, so I'm not sure if I'm really doing it right... Either way, gets me high, and it seems more effective. Also I don't really blow out smoke, but a few hits have a lil smoke when it really starts to burn.