Ongoing experiments with the CCDSPEC spectrometer – this time a white light LED in my garage.
Compare my spectrum above to a typical spectrum from the internet:
Above reproduced in https://electronics.stackexchange.com/questions/149683/do-standard-white-leds-produce-a-full-spectrum-of-light
Warm white LEDs vary a bit from this – see https://led-brdf.wikispaces.com/Introduction+to+LEDs
Generally single colour LEDs have a simple graph more like my own – so I am not sure why mine shows a single peak only rather than the dual peak above.
….The bulb is 5.5W 220-240V B22d 45mA 470 lm 2700K not dimmable EB1 400781 82067 Muller-licht International bulb.
A graph can be seen at https://www.ledsmagazine.com/articles/print/volume-12/issue-10/features/street-lights/light-pollution-depends-on-the-light-source-cct.html that shows that the second peak is more pronounced at 2700K: This still does not explain why only one peak on my spectrum though.