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3 December 2016 at 12:57 pm #577698
Is this for spectroscopy? If so you can’t use twilight or LEDs. You need a light source with a smooth spectrum with no features.
EDIT: you might be able to get away with LEDs in some parts of the wavelength range in higher resolution spectroscopy but I dont know of any LEDs which have a smooth enough spectrum or wide enough wavelength coverage for the ALPY for example