当选用汞灯、钠灯光源时，可按用户要求将功率因数提高到90%。
Power factor of sodium lamp and mercury lamp can be improved 90%.
为了准确到位地表达第四大桥这富有历史感的红色，这些灯具中采用的是钠灯光源。
In order to restore the historic red colour of the Forth Bridge correctly, Alessi fitted these floodlights with sodium vapour lamps.
为了准确到位地表达第四大桥这富有历史感的红色，这些灯具中采用的是钠灯光源。
In order to restore the historic red colour of the Forth Bridge correctly, Alessi fitted these floodlights with sodium vapour lamps.
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