OHP retrofit candidates

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What makes a good candidate for retrofitting?

I have two sizes of overheads, and each has its bulb in different places. The Apollo AI2000 is more portable and has its bulb towards the front and reflecting off a mirror to shine the light upwards. The AI1000 is taller and has its light at the bottom and shines straight up. I have a Bell & Howell 3870 and Da-Lite/Porta Scribe G-100 have the same shape config.
 
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