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| lamp efficacy; luminous efficacy | |||
| efficiency; operating efficiency | |||
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efficiency : 25 do fraz, 13 tematyki |
| Budownictwo | 1 |
| Chemia | 2 |
| Ekonomia | 2 |
| Elektronika | 1 |
| Finanse | 1 |
| Marketing | 1 |
| Nauka o ziemi | 3 |
| Nauki o życiu | 2 |
| Nauki przyrodnicze | 3 |
| Pospolicie | 5 |
| Rolnictwo | 2 |
| Technika i technologia | 1 |
| Technologia informacyjna | 1 |