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Best backlighting for it would be ELP. It provides nice even illumination and it is very thin and flexible. In fact it looks like piece of thin plastic. It is driven by about 100V AC and it uses very little power. As far I know it came in three colours only, green, blue and kind of yellow. Possible source of ELP would be alarm system LCD keypad. Keypad would also have invertor to drive it.
Second choice would be red SMD LED, if there is room to fit them. Illumination would be spotty and numbers would not be as clear as with ELP illumination
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