Dear,
If your light meter measures in "lux" or "candles" - I do not have a good answer.
But, if it gives you uE m-2 s-1, than you can convert to mW cm-2 if you know the wavelength of your light by using the following equation
J = N x h x n / w
N: Avogadro number (6.023E+23)
h: Planck constant (6.626E-34)
n: speed of light (3E+8)
w: wavelength (for example fo red light 700nm, so 7E-7)
Example, if you have 500uE m-2 s-1 @ 700nm
it is equal to 8. 55 mW cm-2 (see my attached excel).
Best,
Paolo.
I don't know which light meter will you intend to use but normally light metter often measure illuminance in lux. I think you can use a solar panel to measure light intensity by calculating power and temperature. Hope to hear good news from you
Dear,
If your light meter measures in "lux" or "candles" - I do not have a good answer.
But, if it gives you uE m-2 s-1, than you can convert to mW cm-2 if you know the wavelength of your light by using the following equation
J = N x h x n / w
N: Avogadro number (6.023E+23)
h: Planck constant (6.626E-34)
n: speed of light (3E+8)
w: wavelength (for example fo red light 700nm, so 7E-7)
Example, if you have 500uE m-2 s-1 @ 700nm
it is equal to 8. 55 mW cm-2 (see my attached excel).
Best,
Paolo.
Short answer - you can't with any precision. Illuminance, in lux, is the integral of power density (power at wavelength) weighted by the luminosity function (see wikipedia articles on 'lumen' or 'luminosity function' It is impossible to precisely map illuminance back to irradiance but some kind of approximation may be possible. However, a light meter is almost certainly, at its core, a photovoltaic device, which measured W/m2 (at some spectral response) so it might be hacked if one could get at the internal circuitry.
Which company light sensor researchers mostly use to measure small LED intensities in mW/cm2
I recommend the optical power meters from Thorlabs (wavelengths from 190 nm to 20 µm Powers from 500 pW to 10 W possible), which can directly display the average power density in W/cm² or the energy density in J/cm².
Best regards
Patrick
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