lumen second
(physics) A derived SI unit of luminous energy.
Third-person singular simple present indicative form of involve
(transitive, rare) To fly before or in front of.
Relating to pyrography.
研究者は異なる電球の出力を比較するために、LEDの総発光量をルーメン秒（光エネルギーのSI派生単位）で定量化した。
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