PHILI-LITE LUMINAIRE

Sun (Auckland), Volume III, Issue 759, 4 September 1929, Page 14

PHILI-LITE LUMINAIRE

90 PER CENT. OF LIGHT AVAILABLE i The new Phili-Lite glassware fittings i or Luminaries introduced by Philips i Lamps Tor the iilumniation of .public } buildings, offices, warehouses, depart- ! mental stores, shops and similar build- ! ings, present a number of noteworthy ] features. Of chief importance is the three-ply glass of which the Phili-Lite Luminaire is constructed. First next to the lamp comes a layer of clear glass, then a layer of opal for intensifying the light, and then a layer of • glass to give the “daylight” effect. The opal skin is only one-sixty-fourth, of an inch in thickness, and the inner layer, which gives the daylight effect, is one-thirty-second of an inch. This j filters the rays of light, subduing the excessive red and yellow rays. The outer layer of clear glass is intended only to make up a reasonable thickness to give the fitting sufficient strength. The net result is that the absorption of light by the Phili-Lite is only 10 per cent, of the total emitted by the lamp. The remaining 90 per cent, is available for illumination. This is remarkable as the average amount of light absorbed by even high-grade fittings is usually 20 to 25 per cent., and in the cheaper types may approach as high as 50 or even 70 per cent;., leaving Jess than half the light actually available for use. The Phili-Lite Luminaire is totally enclosed; dust, dirt, flies, beetles and such extraneous nuisances cannot get in. 7