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| amount of light; light quantity | |||
| luminous energy | |||
| lamp output | |||
| quantity of light (the product of the luminous flux by the time it is maintained; unit: lumen-hour, Im-hr) | |||
| quantity of light | |||
| Lichtmenge: 8 phrases in 1 subject |
| Optics branch of physics | 8 |
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