Archived posting to the Leica Users Group, 1996/06/06

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To: leica-users@mejac.palo-alto.ca.us.I.just.purchased.a.used.Chromega.color.head.I.took.the.unit.apart
Subject: Chromega color head
From: jbuf@ix.netcom.com (John Irvin Buford)
Date: Thu, 6 Jun 1996 18:10:44 -0700
 
to clean it up and try to understand just how this works.  When I got 
it apart I realized just how small the lamp compartment was, and 
thought that it must get very hot during long exposures.  My concern is 
that with the temperature build-up (due to long exposures) wouldn't 
this shorten the life of the color filters and possibly the bulb.  When 
I had the cover off of the power supply I realzed how easy it would to 
re-wire the unit so that the fan could be controlled from a seperate 
switch, therefore allowing to run constantly.  Or, I could build a 
timer circuit that would allow the fan to run for five minutes after 
the bulb had been extinguished.  

My question is twofold:
 
    1. Am I correct in my assumption that the heat build-up will 
shorten the life of my filters and bulb?

    2. Because some lamps are designed to function better when allowed 
to cool naturally, would I damage the lamp by force cooling.


Thanks for any insight in to this matter.

John N3BVH