Illumination notes

Incandescent-Lamp Ratings. A movement is under way in continental Europe to change the ratings of incandescent lamps from watts t o decalumens. The adoption of such ratings would result, when further increases in efficiency are achieved, in giving the customer the same light at lower power cost, instead of more light for the same power cost, as is now t h e case in t h e United States under t h e wattag e ratings. Were adequate levels of lighting intensities n ow generally prevalent, the change in rating would seem logical; but since in fact such levels are still far from attainment in most lighting installations, there would seem to be a strong argument in support of the contention that such change in lamp ratings would be premature.