CDM Output Uniformity

gco

Veteran
Recently purchased a used CDM and noticed very distinct green spots at about 1 o'clock and 7 o'clock positions at full spot after warm up. There is also a dark line running vertically from about 12-6. The reflector is not perfectly aligned with the center of the bulb and lens so this may be the reason for the dark line. Not sure about the green spots though. They diminish when adjusting to flood but they are definitely noticeable. I'm wondering if this a just a characteristic of the bulb output. Anyone with experience have any thoughts on this?
Thanks.
 
has anyone ever tested their cdm/metal halide on a wall to check the light pattern at spot and flood? if so, any variations in the light pattern?
 
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