The lighting power density (LPD)of general lighting in room or place is taken as the criterion of energy efficient lighting.
该文建议应采用照明功率密度（LPD）作为隧道照明的节能评价指标。
This article suggests that lighting power density (LPD) should become the evaluating index of tunnels energy-saving lighting.
该文建议应采用照明功率密度(LPD)作为隧道照明的节能评价指标。
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