noun | noun | to phrases
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| Lichtstrom m | |||
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| Hohlraum m; Höhlung f | |||
| Lumen n (unit of light current; 1lm = 1 cd • sr) | |||
| Lumen n (unit of luminous flux) | |||
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| lm | |||
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lumens : 4 phrases in 3 subjects |
| Measuring instruments | 2 |
| Optics branch of physics | 1 |
| Technology | 1 |