Patent ID: 7527393

Claim:
A method for increasing useable light from a high intensity lighting fixture to a target area, the lighting fixture comprising an interior space, an arc tube in the interior space substantially surrounded by a reflecting surface, and a glass lens across an opening to the interior space to produce a controlled, concentrated beam that is generally converging in nature from the fixture comprising: a. sealing the lens to the fixture at the opening with a sealing member that has an outgassing characteristic when exposed to at least certain wavelength light; b. shielding the sealing member from light from the arc tube or reflecting surface; c. transferring heat away from the sealing member during operation of the fixture; so that more light is available for the target area for no more energy by at least reducing the release of volatile material by outgassing from the sealing member inside the fixture and deposit of outgassed material on the reflecting surface or lens.