Has anyone out there heard of a NH360 bulb?
I come across one the other day.I did some research and found. It was used to replace a 400 watt M.V. used in street lights,and gives the same output as a 400 watt H.P.S. without having the expense of changing the ballast.
The high pressure sodium that are the yelloish ones used today because they use a lot less power.
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Poppa Bill