might find your answer in here
The Ultimate Stoner Gadget: Hands-On the Volcano Herb Vaporizer - Gizmodo
station Reviewed by station on . Got a question about the Volcano well i've had my volcano for about 3 months and loving it. But i've always had this one question - what does the control light mean? Sometimes i look at it and its not lit, and other times it is lit, but i never know what it means? Anybody? Thanks! Rating: 5