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Double-Ended HMI Globes Orientation Question


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#1 Steve London

Steve London
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Posted 31 July 2010 - 11:04 AM

Just bought a couple of 575W veteran QuartzColor Sirio2 HMIs and need to install the double-ended globes correctly.

Within the bubble the electrodes are round but inside the glass arms they have a flattened portion. One fixture has a diagram showing the flat part must be horizontal -- flat -- not vertical.

My question is about the bubble itself. Both have a little "nipple" which must have been used in blowing/holding/evacuating/gas charging the bubble during manufacture. Should that nipple be towards the reflector or the fresnel? I guessed towards the fresnel so as to interfere least with light going towards the reflector.

Experts, please?
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