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  #1  
Old 12-13-2007, 12:57 PM
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Lightbulb conversion of lux to watts

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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  #2  
Old 12-13-2007, 07:03 PM
Roy Nakatsuka
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Default 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 75-watt incandescent light bulb produces about 1200 lumens. A 100-watt 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.
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  #3  
Old 05-18-2009, 11:31 PM
Adithya
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Default 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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  #4  
Old 05-23-2009, 12:34 AM
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Default 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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  #5  
Old 05-23-2009, 12:19 PM
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Default Re: conversion of lux to watts

Quote:
Originally Posted by Unregistered
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
To do silver soldering you will probably need a flame such as oxy-acetylene. You will not be able to do it with an iron, as you need to get both parts you are joining hottter than the melting temp of the silver solder.

Hope this helps.
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  #6  
Old 08-03-2009, 04:43 AM
pravindesai1982
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Default Re: conversion of lux to watts

Quote:
Originally Posted by Unregistered View Post
Trying to determine how many lux are in a 75 or 100 watt light bulb. Can't find the conversion anywhere else....
please convert 2000 lux into watt
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  #7  
Old 09-12-2009, 07:11 AM
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Question 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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