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Light Bulb Shape Guide: PAR-Shape — 1000Bulbs Blog
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Light Bulb Shape Guide: BR & R Shapes — 1000Bulbs Blog
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Maxlite 98499-13P38WD27FLB/2P/WS PAR38 Flood LED Light Bulb - Amazon.com
Standard Bulb vs. PAR Flood Light - The Nitpicky Artist
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