BushMoot: Come along to the amazing Summer Moot 31st July - 5th August (extended Moot : 27th July - 8th August), a festival of bushcrafting and camping in a beautiful woodland PLEASE CLICK HERE for more information.
Sounds quite specialist to me, which in English means 'expensive'.
How about taking an old phone with a monochrome LCD screen and swapping out the backlight LEDs for red ones? (Assuming you know someone who can solder SMD )
unfortunalty putting a filter on it will remove anything in that colour from vision and the reason red light for night map reading is a bad idea (well any colour light really )
what you need is an app for that to custom the colours no idea how to write one or if your phone can use one
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