Finding the intensity of radiation ?

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To find the intensity of radiation from a 150 W Xenon lamp at a distance, the theoretical intensity can be calculated using the formula 150/(4πr^2) W/m^2, assuming no absorption by the air. A photodiode can be used to measure the intensity, and a photometer can provide output for visible light irradiance. This calculation gives a maximum value for intensity, and additional data about the bulb may refine the results. Understanding these methods will help in accurately determining the light intensity on a surface. Accurate measurement techniques are essential for precise applications.
mkbh_10
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I have a 150 W Xenon lamp with me and I need to know what is the intensity(W/m^2) of light being radiated on a surface at x distance away . How do I do it ?

Can I use a photodiode, if yes then how ?
 
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You could look for a photometer which can output irradiance for visible light.
 
I can tell you how to CALCULATE the intensity if you assume that 150W is all light.
The 150W passes through the surface of a sphere of radius r as it spreads out (assuming no absorbtion by the air) so the theoretical intensity = 150/(4πr^2) W/m^2
I am certain that this is not a good enough answer for you but it will give you a maximum value and if you have more data about the bulb then I hope it is of some use.
good luck
 

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