Computing light level (W)

[bilal_oct]

How to compute the "light level" if there are 135000 photons at a given wavelength ?

 

[andre_luis]

The question is likely to be not easily answered, particularly if the spectrum is wide.
Most light sensing devices have different responses depending on the wavelenght.

 

[bilal_oct]

Consider BGO Scintillator as source of producing photons. So, if BGO produces 135000 photons then what will be the "light level (W)" ?

 

[andre_luis]

At this article you can see that it is not a trivial answer, but perhaps should be obtained from experimentations; the typical frequency response of both cyntilators an photodetectors are strongly dependent on not only the material composition, but varies from one manufacturer to another. Furthermore, each spectrum is not represented by simple equations.

 

[albbg]

If the photons are emitted at a single wavelength "L" each of them have energy:

E = h/L, where h is the Planck constant = 6.62exp(-34) J*s

E is in Joule

You know the source generates N photons/s then the power (power=energy/time) will be, simply:

P = N*h/L

However you didn't specify the 135000 photons in which amount of time are generated.