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At 03:48 PM 8/11/99 -0400, you wrote:
>> Date: Mon, 9 Aug 1999 11:53:55 -0400
>> From: "Claxton, Andrew" <Andrew.Claxton at CAN_XEROX.com>
>> Subject: Metal Halide bulb flickering
>> I have a 175 watt metal halide bulb that will stay on for a couple hours -
>> flicker for a minute - then go off, then come back on about 20 minutes
>> later  and repeat the pattern.  

Listen to the man!   Pattern.  On for hours (heating up), off for 20
minutes, repeat.

There is almost certainly a thermal shutoff in the ballast and after two
hours it gets too hot to continue and stops.   After 20', it has cooled
down enough to reset and starts up again.   Try cooling the whole affair
down a bit (bigger fan, removing shrouds, etc.) and see if it doesn't do
just fine.
Dave Gomberg, San Francisco            mailto:gomberg at wcf_com
The latest in CO2 news:     http://www.wcf.com/co2iron 
Tropica MasterGrow in the USA:      http://www.wcf.com/tropica