How many lumen in a 25 watt incandescent light bulb?

a 100W incandescent lamp emits 120 candela.

lumen is the unit for luminous intensity per steradian ,an lamp emits in all direction

therefore a 16.25watt lamp contains 19.5 lumen

Answer

The lumen is the SI unit for luminous flux -which describes the output power of visible light expressed in photometric units. The ratio of a lamp's output luminous flux to its input power is termed 'efficacy', expressed in lumens per watt. The efficacy for incandescent lamp varies from 5-15 lumens per watt. So the output of a 16.25-W incandescent lamp will be between 80-245 W.