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HPS comparing the effects of color rendering
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I just recently got a few new lamps including a HPS Deluxe which the order code in this case would be LU70/DX/MED/ECO
That means this HPS (from the right side picture) is a GE 70 watt Deluxe with a medium base and low mercury
One of the differences from my own eyes, is I observed the Deluxe version has a thicker arctube. Also it does make better color rendering than the regular HPS...almost like an incandescent...but warmer
The one on the right is a Sylvania made off brand regular HPS
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This lead, indeed, to shorter arctube then the classic, as higher pressure yield higher voltage drop per unit lenght, so for the same (compatibility) arc voltage and current this mean shorter tube with higher arc load (more watts per unity of arc length)
And when higher pressure is necessary, the working temperature has to be increased, as the pressure correspond to saturated vapor pressure of the lamp fill.