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I use Leds reflecting back on the inside of the rear of the light box and that light is further diffused by a "diffuser" it just works well, I have built over 400 of these for astro photography and have rarely had any problems. Only time was when a guy left his turned on for over 3 months and the Leds deteriorated, I replaced these for him and as far as I know it still works well.
I have built these for scopes as small as 50 mm right up to 14" plane wave beasts.
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