Commercial Phosphorescent Lights.

Manufacturer and Builder ?, 1893

We are pleased to see that the long-prophesied and much talked of "cold light" which is to revolutionize modern lighting, appears now to have been promoted from the rank of a laboratory apparatus to that of a lamp for commercial lighting. An enterprising firm in England is making a good beginning by introducing commercial lamps in which the light is produced by high-tension discharges in phosphorescent vacuum tubes. Although, as with most inventions of a radically new type, there are still very serious objections to it, yet these are being overcome, one by one, and it is not unlikely that this beginning will encourage others in the same field. The subject is of special interest just now, owing to the unsatisfactory state of the incandescentlamp question. As there are no fundamental patents to hinder the developing of such lamps, inventors need not fear being handicapped by some future legal decision.

Attention might here be called to the recent paper of Dr. Sumpner on diffusion of light, from which it appears that an effective illumination does not depend alone on the brightness of the lamps, but that if the light is diffused, a much smaller candle-power will produce practically the same illumination. Phosphorescent light, in its very nature, is a diffused light, and the actual candlepower of such lamps is therefore not the only feature to be considered.

To properly comprehend the cost of the diffused light from such lamps with that from incandescent lamps, an experiment should be made by lighting the same room, first with one kind and then with the other, noting the different effects, entirely independently of the candlepower of either of the lamps. From such an eminently practical test the relative costs could then be deduced; even the most practical man could not object to such a test.

- Elec. World.

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