Arc thickness in mercury & metal halide during run up

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Topic: Arc thickness in mercury & metal halide during run up (Read 2472 times)

dor123
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I am noticed that while in mercury lamps warming up the arc is fatter then in full output, in metal halide lamps the arc already thin regardless the mode of operation. why?

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form109
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hmmmmm...that's strange...all HID Arcs should start out Fat because of the low pressure in the arctube,as the pressure increases the Arc constricts..

« Last Edit: February 22, 2009, 08:28:46 PM by form109 »

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TudorWhiz
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Well MH has a higher pressure than MV as far as I know

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don93s
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Quote from: dor123 on February 22, 2009, 12:09:03 PM

I am noticed that while in mercury lamps warming up the arc is fatter then in full output, in metal halide lamps the arc already thin regardless the mode of operation. why?

I've never seen a M.H. lamp with a thin arc at any time of run-up. In fact, the arc appears shorter and fatter than M.V. because of the shorter fatter arc-tube. Perhaps there are other types I haven't seen yet.

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