A 25 W compact fluorescent light bulb puts out around 1700 lumens ; if that light is radiated equally in all directions, it will have an intensity of around 135 cd (135 lumens/steradian). Source: Internet
A lamp with the same rated lifetime but designed for 230 V would produce only around 12.8 lumens per watt, and a similar lamp designed for 30 volts (train lighting) would produce as much as 19.8 lumens per watt. Source: Internet
A typical 13-watt LED lamp emitted 450 to 650 lumens, citation which is equivalent to a standard 40-watt incandescent bulb. Source: Internet
First electric lamp, over 10000 lumens and thus 1000 times brighter than candles. Source: Internet
Even at this high temperature, a lot of the radiation is either infrared or ultraviolet, and the theoretical luminous efficacy (LER) is 95 lumens per watt." Source: Internet
In 2002, Lumileds made five-watt LEDs available with luminous efficacy of 18–22 lumens per watt (lm/W). Source: Internet