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(diff) (hist) . . Discharge Lighting; 20:26 . . NT (Talk | contribs) (tidy up)
(diff) (hist) . . Discharge Lighting; 01:12 . . NT (Talk | contribs) (pic)
(diff) (hist) . . Discharge Lighting; 01:08 . . NT (Talk | contribs) (→Colour Perception - )
(diff) (hist) . . Discharge Lighting; 01:00 . . NT (Talk | contribs) (→Colour Perception - pics of spectra)