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| |||
| lamp efficacy; luminous efficacy | |||
| efficiency; operating efficiency | |||
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efficiency : 25 phrases in 13 subjects |
| Agriculture | 2 |
| Chemistry | 2 |
| Construction | 1 |
| Earth sciences | 3 |
| Economy | 2 |
| Electronics | 1 |
| Finances | 1 |
| General | 5 |
| Information technology | 1 |
| Life sciences | 2 |
| Marketing | 1 |
| Natural sciences | 3 |
| Technology | 1 |
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