IES Lighting Handbook: 1981 reference volume
For example the two-lamp 40-watt rapid start ballast losses have been reduced by 4 or 5 watts per lamp over ... Preheating can be effected by use of a manual switch or one which is activated by application of voltage to the ballast circuit.
| Title | : | IES Lighting Handbook: 1981 reference volume |
| Author | : | Illuminating Engineering Society of North America, Illuminating Engineering Society |
| Publisher | : | - 1981 |
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