SvenNYC.
With regard to your question about the sodium/metal halide lights, `going out` during there illumination time,
This is an easy one, most of the time it is due to lamp failure,
the lamp will strike normally but then will get progressively brighter, then will go out, in about 5 to 10 min the lamp will re strike and the whole pattern starts again,
there is safety feature designed into all high pressure lamps to protect them from exploding,
if the lamp is not replaced it can cause premature failure of the lamps control gear.
Hope this helps.
John H
