Allyson Battle Lamp Shades September 24th, 2018 - 01:45:52
Lamp has one electrode in each end of the arc tube and the current goes through gas to fill gas inside a xenon gas and there's an amalgam of mercury and sodium in the arc tube.The reason why there's mercury and sodium is for two reasons, number one: it controls the vaporization rate of the sodium during warm-up and number two. The mercury vapor lends its blue rays to the light to make the light less monochromatic it's more full-spectrum, because it's got blue rays as well as yellow and red and orange rays. So it's a technically a white light source, even though it doesn't look white. It is a type of white light source objects lighted by it. At least you can tell the color of them not that well, but you can you know.
So that's was the advantage of the high pressure sodium design, plus they're, more compact and longer-lasting than the old low pressure. Sodium lamps were, though they're not as efficient is low pressure sodium, but their advantages outweigh their disadvantages. Obviously, they're an interesting lamp in that to start the lamp when it's cold, they have to pulse it with a high voltage pulse to start the arc through the lamp. So to do that, they use an external electronic circuit built into the ballast to start the lamp. It works almost like a coil on a car how it fires a spark plug.
It just hits the lamp with a high voltage spike and that's what starts the arc once the arc starts it's through xenon first, so the lamp will light up almost a sky-blue color. Then it turns blue because the mercury vapor the mercury rather vaporizes. First, then, when the mercury generates enough heat the sodium vaporizes last and then the color will finally shift over to the orange color as the sodium vaporizes into the mercury arc stream and the two colors combine the blue and the orange combined. Then you get that purplish orange or whatever color the lamps vary by brand by color, so they're, not all exactly the same, but the lamp has pretty good efficiency. It didn't turn out to be as high of a efficiency is.
Is they originally thought? The lamp itself is very efficient, but the auxiliary equipment used with it. The ballasts have to be very lousy because the arcs run at low voltage, so they've got to step that voltage down in the ballast. Okay, here's another high pressure, sodium lamp, but this one has a little bit different design. It's actually a kind of a homeowner brand naming all eight like for for the average consumer lights of America, and they did things a little differently instead of using an electronic circuit to pulse the lamp to start it. As I previously said, this lamp has, and you can see it there running along the arc, tube, there's a flat strip and then there's a little wire that runs down alongside the arc tube and what that does.