beam lumen
常见例句
- Operators can also hold the switch down to run the flashlight in low mode, producing a 50 lumen light beam and a longer 12 hour runtime.
ENGADGET: Explosion-proof flashlight could be the first to outlive its owner - By pressing the switch once, the light operates in high mode to produce a full power 130 lumen light beam with a long 4 hour runtime.
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