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Originally Posted by V
High Pressure Sodium.
Mercury Vapour are a blue-white light.
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There is still mercury in the lamp to balance the colour temperature, at least the ones I've seen.
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I was the project manager, so that helped. 
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What is the unit model/make being installed? I haven't looked up at one closely, also the crews seems super stealthy about installing them I have not seen any of them done.
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Originally Posted by Lubicon
the light is brighter but the coverage doesn't seem to be as large for each light which leaves dark(er) spots between each pole.
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Could be but because the light is more white I think it makes up for it.