Estimating LED Lumens for Your Space - Roberts Electric
Lumen to Watt Comparison - Energy vs Brightness
GE Lighting 38460 LED Flood Light Bulb, Bright White, Clear, Par38, 500 Lumens, 7-Watts - Quantity 1 - Amazon.com
What size of LED lamp will be equivalent to 150 Watt halogen lamp? - Quora
Here are some lumen per watt (LPW) targets for common LEDs
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Converting from Traditional to LED Lighting | Blog | Commercial Lighting
LED vs Halogen Lighting - Which one is the Best Choice?
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New Energy Efficiency Standards for Lightbulbs: What You Need to Know | Department of Energy