Dear colleagues,
I am doing a research using visible light as simulated light on the photocatalysis reaction. Then, I want to convert a Watt (W) of lamp to the light intensity (flux). Nevertheless, I don't have any tools to measure it. Is there any formula to convert them directly? Or it needs any paramaters?
Dear F. Febiyanto.
Watt = J/s is a unit of power. And
What you want is a flux of photons (mol of photons/s or Einstein/s). It means that you need to convert J in E (or mol).
It requires the energy of one photon of your lamp :
- if it is monochromatic, it is easy you just have to convert the wavelength or the energy in Joule.
- if it is polychromatic you need your irradiance spectra to get the distribution of your photons and the calculation is less easy.
Then you must divide the power of your lamp (J/s) (i.e. the total energy sent by all the photons of your lamp per unit of time) with the energy of the photons of your lamp. It gives you a number of photons per unit of time = a flux.
Best regards.
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