| http://www.w3.org/ns/prov#value | - Low pressure sodium introduced by PHILIPS in 1932, is STILL the most efficient lamp made, pure yellow monochromatic, , so if it???s good, it???s still available, LPS has also been improved over the decades. all kinds of incandescent made, better, longer lasting, more efficient, just cus it???s not 100 W, and mostly heat producer, the new ones are more light for the watts in, what a concept!
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