Here are some lumen per watt (LPW) targets for common LEDs
led - What is the theoretical limit of lumen/watt for lighting systems? - Electrical Engineering Stack Exchange
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New XLamp® CMB LEDs Deliver High Lumen Density & More Lumens Per Watt - Cree LED
How To Determine How Many LED Lumens You'll Need To Properly Light Your Space | ArchDaily
GE LED Light Bulbs, 40 Watt Eqv, Soft White, A19 General Purpose Bulbs (4 Pack)
Optics & Photonics News - The Quest for Lumens per Watt
U.S. Energy Information Administration - EIA - Independent Statistics and Analysis
Wattage vs Lumens - Know the differences | e-green electrical
Ledrise - High Performance Led Lighting LED luminous efficacy (lumens per watt) explained
LEC Expert blog - Thoughts and expert solutions in LEDs
Lumen to Watt Comparison - Energy vs Brightness
TAM ENERGY
Lumens Calculator: How Many Lumens Do I Need for a Room? – Insights
How is lumens per watt calculated? - Quora
White LED lights with 135 Lumens per Watt About Ten Times Better than Incandescent | NextBigFuture.com
4- GE LED 75 watt Soft White General Purpose Bulbs A21 PC 92979 43168929790 | eBay
Lumen to Watt Comparison - Energy vs Brightness
lumens per watts, for LED lamps, Gooseneck LED lamp, LED lamps
