Trying to determine how many lux are in a 75 or 100 watt light bulb. Can't find the conversion anywhere else....
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conversion of lux to watts
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Roy Nakatsuka
Re: conversion of lux to watts
Hello Poster,
Converting between watts and lux doesn't quite make sense, because the wattage of a light bulb is a property of the light bulb, whereas lux measure the illumination on a surface.
For example, if you move twice as far from a light bulb, then the lux reaching you decrease by a factor of four, simply because you moved farther away.
You may be thinking instead of a unit called a lumen. The rating of a light bulb in lumens is usually shown on the packaging.
A traditional 75watt incandescent light bulb produces about 1200 lumens. A 100watt bulb produces about 1600 lumnens. But even with lumens, the conversion from watts will depend on the brand and characteristics of the specific light bulb.

Adithya
Re: conversion of lux to watts
dear Roy,
I needed a help from u...I have HeNe Laser (green) at 543.5nm of whose output power is to be determined..Can u help me find a method to convert lux to Watts/mt^2...???
Thanking u,
Adithya
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Unregistered
Re: conversion of lux to watts
G'Day Roy (I hope I got your name right) what I am trying to do is understand when a manufacture rates and electric soldering iron in watts say 70 watts what that is in C or F degrees for example silver solder (some) has a melting point of approx 1200C and I think the nearest in watts on an iron is 125watts.I am not sure.Hope this makes sense.bill
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Re: conversion of lux to watts
Originally posted by UnregisteredG'Day Roy (I hope I got your name right) what I am trying to do is understand when a manufacture rates and electric soldering iron in watts say 70 watts what that is in C or F degrees for example silver solder (some) has a melting point of approx 1200C and I think the nearest in watts on an iron is 125watts.I am not sure.Hope this makes sense.bill
Hope this helps.
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Unregistered
Re: conversion of lux to watts
I hope someone could help; I have a 200 mW green laser pointer with 532 nm wavelength, how can know it's output in lux?
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