Illuminance of FL Tubes Controlled by Depths of Gap Between Positive Column and Phosphor Screen
Volume 3, Issue 3, June 2015, Pages: 93-104
Received: May 11, 2015;
Accepted: May 23, 2015;
Published: Jun. 5, 2015
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Lyuji Ozawa, The Japanese Government licensed consultant in science, Beijing, China
Since the opaque phosphor screens cover up the inside of the FL tubes, the presence of the depths of the gap between positive column and phosphor screen has ever reported in the study on the lighted FL tubes since the invention of the FL tube. It has found that the depths of the gap in the lighted FL tubes conceal the unrivaled advantage of the FL tubes over the solid lighting devices. The invisible depths of the gap are non-distractively and quantitatively determined by the measurements of the build-up curve of the light intensities from the lighted FL tubes in the Ulbricht Sphere. The determined depth of the gap of the selected commercial 40W-HCFL tube as the best one was 3 x 10-3 m. The depths of the gap are markedly changed with the FL producers, indicating no quality control of the gaps. The unexcited Hg atoms in the gap act as the optical filter for the UV lights from the positive column before reaching to the phosphor screen. The results suggest us that if the depth of the gap reduces to 3 x 10-4 m, the illuminance (lm m-2) of the present 40W-HCFL tube will go up to 2.5 times. The systematic study on the gaps of the lighted FL tube remains for a future study.
Illuminance of FL Tubes Controlled by Depths of Gap Between Positive Column and Phosphor Screen, Science Research.
Vol. 3, No. 3,
2015, pp. 93-104.
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