Fluorescent lighting fixture

Claim 1

APPARATUS COMPRISING, A LIGHTING FIXTURE, A PLURALITY OF AT LEAST SIX LIGHT SOURCES IN SAID FIXTURE AND CONSISTING ENTIRELY OF FLUORESCENT TUBES, A PLURALITY OF AT LEAST THREE COMPOSTIONALLY DIFFERENT PHOSPHORS SEPARATELY CONTAINED BY SAID TUBES, A FIRST OF SAID THREE CONTAINED PHOSPHORS BEING INCLUDED AMONG A MINORITY OF SAID TUBES CHARACTERIZED BY FLUROESCENCE PROPERTIES WITH AN X CHROMATICITY COORDINATE VALUE OF LESS THAN 0.277, A SECOND OF SAID THREE CONTAINED PHOPHORS BEING INCLUDED AMONG A LARGER NUMBER OF SAID TUBES CHARACTERIZED BY FLUROESENCE PROPERTIES WITH AN X CHROMATICITY COORDINATE VALUE OF MORE THAN 0.328, AND THE THIRD OF SAID THREE CONTAINED PHOSPHERS HAVING A FLUORESCENCE PROPERTY WITH AN X CHROMATICITY COORDINATE VALUE INTERMEDIATE THOSE OF THE FLUORESCENDE PROPERTIES OF SAID FIRST AND SECOND PHOSPHORS, AND THE VARIATONS WITH WAVELENGTH IN THE FLUORESCENT PROPERTY OF EACH TUBE AND TH LUMENS OUTPUT RATING THEREOF BEING IN WEIGHTED RELATION WITH THE SAME PROPERTIES OF EACH OF THE OTHER TUBES TO BE ADAPTED TOGETHER TO PRODUCE FROM ALL SAID TUBES ON OVERALL LIGHT OUTPUT WHICH HAS AN X CHROMATICITY COORDINATE VALUE IN THE RANGE EXTENDING BETWEEN AND INCLUDING THE X VALUES OF 0.320 AND 0.336, AND WHICH HAS A Y CHROMATICITY COORDINATE VALUE EXTENDING BETWEEN AND INCLUDING THE Y VALUES OF 0.334 AND 0.350 AND WHICH, FURTHER HAS A SPECTRAL ENERGY DISTRIBUTION CURVE WHICH IS SIMULATIVE OF NATURAL OVERCAST NORTHLIGHT.