 |
| |||
| light output; lumen output | |||
| light power (efficiency, output); luminous efficacy (e.g. of a tungsten filament lamp) | |||
| light output ratio | |||
| light power; luminous efficiency; luminous flux; luminous intensity; optical power | |||
| Lichtleistung: 3 phrases in 2 subjects |
| Measuring instruments | 1 |
| Optics branch of physics | 2 |