LeDiamond Opto Corporation, we are the LED filament producer in Taiwan. Our LED filament is the only one which has LM80 report in comparison with others. Besides, the efficiency of our filament is 160 lm/W@2700K and CRI 80, which is the highest mass production standard compared to other filaments. So using Tesla 1505 4in1 module in candle light can reach 500 hot lm, and using Tesla 2903 4in1 module in A19 can reach 700 hot lm. More information please contact me!!