Great study on halogen over-volting! He goes from 10-20V on a 20W 12V lamp. You can clearly see the benefits of over-volting to at least 14V, but it gets even better at 16 and 18, not to mention 20V which looks as good as maybe even better than the Lupine Betty! I'm definitely going to go to 16V (at least) for my helmet light setup after seeing this.