The Electrical Review, Том 171IPC Electrical-Electronic Press, 1962 |
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Сторінка 662
... lighting to remain unaltered . It is true that in many cases fluorescent lamps have taken the place of filament lamps , but all too frequently this has meant that an insignificant increase in illumination has been accompanied by a ...
... lighting to remain unaltered . It is true that in many cases fluorescent lamps have taken the place of filament lamps , but all too frequently this has meant that an insignificant increase in illumination has been accompanied by a ...
Сторінка 930
1 LIGHTING AND PRODUCTIVITY In its recently published book * the British Lighting XIV. B A IN INDUSTRY AMONG MONG the objectives of the National Productivity Year , which was inaugurated earlier this month , are : - ( i ) to strengthen ...
1 LIGHTING AND PRODUCTIVITY In its recently published book * the British Lighting XIV. B A IN INDUSTRY AMONG MONG the objectives of the National Productivity Year , which was inaugurated earlier this month , are : - ( i ) to strengthen ...
Сторінка 932
... lighting which is of most significance . Taking people aged 45 for example , an illumination over 30 lm / sq ft will produce 85 per cent or more of their maximum possible visual performance , but at lower illumination levels their ...
... lighting which is of most significance . Taking people aged 45 for example , an illumination over 30 lm / sq ft will produce 85 per cent or more of their maximum possible visual performance , but at lower illumination levels their ...
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