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I am experimenting with White and RGB LEDs to see if I can produce LRGB flats with approximately the same photon counts, using similar exposure durations for each flat. With my current torch bulb light box, there is a significant variation between the L and the RBG flats in terms of exposure duration. The torch bulbs produce a predominantly yellowish light.
Looking at the transmission vs. wavelength graph for the SBIG RGB filters, their transmission efficiency appears optimized for the following wavelengths:
R 615-660nm
G 480-550nm
B 425-500nm
The Jaycar catalogue specifies the wavelengths for RGB LEDs as:
R 625nm
G 525nm
B 470nm
So, using the RGB LEDs may seem okay for taking RGB flats? This project is more of an interesting experiment, as I have time on my hands due to the cloudy weather up here in Brissie! So, if it doesn’t work out, the few $’s spent on LEDs won’t be a great loss.
Cheers
Dennis
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