From: ngilman@gilmanresearch.com (Norm)
Newsgroups: sci.physics.plasma
Subject: Discharge lamp operating circuit: a question of novelty?
Organization: http://groups.google.com/


I'm trying to locate any and all references that discuss high-pressure
discharge lamp operating circuits that predate December 1998.
Specifically, a circuit that attempts to reduce lamp flicker and
increase lamp life by staggering or changing or gradually increasing
the current voltage in the start of the initial period.

A good example of what I'm looking for can be found in US Pat No.
6239556, Figure 3.

This technique of alternating the current does not seem particularly
novel and I am assuming some of the experts in the field can point me
in the right direction.

Feel free to email or post with any questions. Thank you.

Norm Gilman