Dear Chaitrali,

welcome,

In order to measure the incident solar radiation it is preferable to use the suitable measuring instrument. You can use a pyranometer for the exact measurement. As this instrument is relatively expensive you can use a calibrated REFERENCE solar cell:

Article Measurement of solar radiation by silicon solar cell

The LUX meter is used to measure visible part of the incident solar radiation.

Best wishes

multiply lux to 0.0079 which give you value of w/m2.

but your lux meter must be with higher reading capacity.

second option you have to measurement for a day with luxmeter and with pyranometer and fit the readings using ms excel.

multiply lux to 0.0079 which give you value of w/m2.

but your lux meter must be with higher reading capacity.

second option you have to measurement for a day with luxmeter and with pyranometer and fit the readings using ms excel.

agree totally with Bhargav answer but in each case it may not be true you need to prepare measurement sheet with different time set ups and intensity of light is also to be recorded may be both with data logger.

The lux meter measures visible part of solar spectrum (0.38-0.78 micro meter), but the solar radiation spectrum is from (0.3-2.4 micro meter).

So I agree with Mr. Kiran Yashwant Shiralkar

Thank you

Already answered by Mr. Bhargava no further comments

Poster Hotspots of Solar Potential in India

There is no direct formula or conversion between lux and W/m2 , it depends on the wavelength or frequency of the light.

but for the sun light, there is an approximate conversion of 0.0079W/m2 per lux

Solar Irradiance of 1 Sun (1,000 W/m2) equals approximately 120,000 Lux. you can get the detail from the link below

https://ieee-dataport.org/open-access/conversion-guide-solar-irradiance-and-lux-illuminance

Where did you get the 0.0079W/m2 value? Thanks

There are also solar radiation estimation equations based on your location, day of year and daily temperatures. Works the best in low humidity environments. Also, despite saying "it cannont be done" remember that you are after some understanding of your solar drier, so a good approximation is better than nothing. It may not be publishable data, but will help you get close to the answer you need.

Milkessa Gebeyehu, do you have the paper, which you have mentioned above?

Hello dear Chaitrali ,

for Ly (cal/cm2) to w/m2 >>>>>> Ly value should be devided by 0,085986

so,

1 Ly is equels to 11,6298 w/m2

ref: Davis climate station:)

Dear Ugur Kezik

Thank you very much for your answer here.

Let me ask should Lux be multiplied or divided by the given constant value to convert the value to W/ sq. meter?

Best regards

Thank you again

Dear Mahmoud Usamah Jasim ,

According to calculation of davis climate station Ly (cal/cm2)) value be devided by constant (0,085986) to w/m2 value...

You can check the attached file in 2 colums by excel...

Best regars

Also one paper was attached related to "Solar radiation unit conversions"