I have some red, blue and white LED bulbs (5 watt) I want to know the actual light intensity values (lumens/PPFD) and wavelengths of red blue and white light spectrums. Is that possible?
You need kind of a calibrated spectrometer. OR tell us what devices you have and we can discuss what you can do.
I guess you need something like Calibrated Integrating Spheres to measure the total power (weighted by Silicon diode sensitivity) https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=4688
The spectrum has to be analyzed by some Spectrometer like https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=3482
Some calculations will be required to compensate for the effect of uneven Silicon/Spectrometer sensitivity and also watts to lumen curve (Luminous efficacy)
Dear Udara,
The spectral power distribution can be determined by a typical fluorescence spectrometer, e.g. from Edinburgh Instruments or Ocean Optics. In order to determine absolute values you need a calibrated Ulbricht (integrating) sphere as pointed out beforehand. However, you have to keep in mind, that the spectra of LEDs shift and quench with temperature and drive (power density). Thus the results will depend on the adjusted measurements conditions.
All the best for your research,
Thomas
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