Quote:
Originally Posted by Quexos
I don't think you mean readers, I think you mean tablets.
Readers are monochromatic and the ones with front lights do not have the choice of color in their light. 
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Thank Quexos. Everyone's comments have assisted me. I have some good material to hand in and whether we're talking readers, tablets or smart phones, there are solutions to viewing the wrong wavelengths for the particular time of day you are reading in this thread's posts.