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How many milliwatts per lumen?

## Answer

###### Devin Bergholt

###### October 25, 2019 1:45AM

There are 1000 milliwatts per lumen.

## Related Questions

###### Asked in Physics, Spectroscopy, Speed of Light

### How many lumen are in 1 Joule?

1 lumen = 1 candela per steradian.
1 candela = 1/683 watts per steradians (assuming 540nm light
wavelength).
Assuming that the light is collected from a single
steradian:
1 Lumen = 1 Candela -> = 1/683 Watt -> Watt = 683
Lumens
1 Joule = 1 Watt per Second -> Watt = Joule/Second
Hence:
683 Lumen = 1 Joule/Second
Under the above
assumptions
1 Lumen = 1/683 Joule/Second

###### Asked in Electrical Engineering, Light Bulbs and Artificial Lighting

### How many lumens does a LED light put out 1 watt led lumens?

Generally speaking, the lumen per one watt of different LED is
different. As far as i known, some LED products can reach 120 lumen
per watt or more higher which from lab or some big famous comapny,
we called this is lab level, but in fact, most of companies and LED
manufactures can not reach this level, theirs LED products are
differenet, some of they can reach 80~90 lumen per watt, but some
is very low, like companies power, technical level, product develop
and many others factor will effect the lumen level. Of course, all
of this conclusion is base on the test report of LED product, like
lumen, color temperature, CRI, illuminances etc parameters.