5000 K and the bottom coloration rendering index rating (none specified) usually achieves 305 lumens at 700 mA with a typical voltage drop of 2.98 volts, which works out to typically 146 lumens/watt. Nichia NVSA119B-V1 and NVSA219B-V1 typically produce 240 lumens at 700 mA with a typical voltage drop of 2.98 volts. Update 8/2/2017: Cree XPEBRO-L1-0000-00D01 and XPEBRO-L1-0000-00D02, out there at Digi-Key, Vape Tanks usually produce 111 lumens at 350 mA with a typical voltage drop of 2.2 volts, vaporenough when the junction temp.
The datasheet indicates 123 lumens/watt when the junction temp. Efficiency of C535A-WJN-CV0W0231 improved higher than I expected from fast preliminary testing at very low currents as present was decreased from 20 to 2 mA, Vape Shop by a hardly measurably smaller proportion than was the case with C535A-WJN-CU0W0231.
This works out to typically forty five lumens per watt at 25 C junction temperature. Voltage is 2.33 volts. Its lumens/watt at 1500 mA might be much less, about 21, due to its peak wavelength most likely being slightly shorter at increased present.
The Kingbright WP7113LSRD is now not being manufactured however 1000's have been in stock as of 2/19/2023. Lumex SSL-LX5093SRD/D is one other one I like, however as of 2/19/2023 it was orderable however not in inventory at Digi-Key or E-liquids Mouser. Replace 7/26/2022: Osram LJ CRBP.01 (talked about as LJ CRBP.01-JZLX-27-3A4A-350-R18 by Digi-Key) is claimed to supply 61-130 lumens at 350 mA with a typical ahead voltage drop of 2.15 volts.
This LED was not but in stock but had an 8-week lead time at Digi-Key as of 12/25/2018. Update 8/2/2017: Osram GA CSHPM1.23-KTLP-W3 and GA CSSPM1.23-KTLP-W3, in inventory at Digi-Key, sometimes achieves 148 lumens/watt at 25 degrees C and 133 lumens/watt at 50 levels C in keeping with its datasheet. As for low energy yellow LEDs: Update 10/12/2009: Osram LY E65F-CADA-46-1-Z, Vape Kits in stock at Digi-Key, sometimes achieves 44.6 lumens/watt in keeping with its datasheet. This implies it usually achieves 133 lumens/watt at 100 mA.
With typical voltage drop of 2.1 volts at 20 mA, vaporenough this means sometimes 59 lumens er watt. Worst case minimal at 25 C and 350 mA is 45.7 lumens with a voltage drop of 3.5 volts, which means 37 lumens/watt.