GLARELESS ELECTRIC LAMPS

Hokitika Guardian, 28 December 1929, Page 2

GLARELESS ELECTRIC LAMPS

PRESERVATION OF EYESIGHT.

The use of a new “glareless” electric lamp is advised in order io minimise eye-strain (writes a London correspondent). The so railed pearl lamp, in which the bulb is subjected to an internal frosting process, was perfected only a year or so ago after nearly two decades of research, and at about the same time success was attained also in the process of making what is known as the opal lamp, which lias a second skin of opal glass superimposed upon the ordinary clear glass bulb AYhereas not more than 20 per cent, of the lamps in use twelve months ago were of the glare less type, today tin proportion has risen to roughly -50 pei cent.

A party of visitors'to the Lighting Service Bureau of the Lamp Manufacturers’ Association, which is situated over the Thames Embankment premises of the Institution of Electrical Engineers, were given demonstrations with a photograhpic electric cell designed to show scientifically that the amount of light lost by the use of the inside frosted bulb is only 31, per cent., whereas the ordinary clear bulb absorbs 2 per cent, of the light created within itself. The British Engineering Standards Association has decided that glareless lamps should be adopted generally for British “standard” lamps specifications up to the 100-watt size, and during the past year the glareless lamp'has been widely adopted by several of the leading railway and road transport companies. During the coming winter the operations of the Lighting Service Bureau will be largely devoted to urging the use of a type ot lamp which is expected to (mv*> an important bearing on the preservation o* .eyesight.