I need a Hotspot analysis

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I have a 15" straight through PJ using the standard lens kit from Lumenlab.

Im using a 250W DE HQI bulb, and an IKEA SOARE Napkin holder for a reflector.

Im getting hotspotting around the bulb arc that can be seen when the screen is all black. The Center of the arc is fine, but there are hotspots on each side of center.

Before I go fiddling with the light engine I wanted some input as to what might be causing it.

Distance from the Bulb to Reflector? If so... should the bulb be closer or further away to eliminate the problem?
 
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