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What element is used in the lighting of street lamps?
Sodium-vapour lamp, electric discharge lamp using ionized sodium,
What is the source of illumination employing vapour of the element Na?
Sodium lamp
What is the work of capacitor in sodium vapour lamp?
A sodium vapour lamp does not include a capacitor in its construction. Any capacitor associated with this type of fixture will be found where the ballast is located and not in the lamp itself.
How does ignitor in sodium vapour lamp work?
Similiar to a flourescent light. The ignitor provides a high voltage potential to excite the sodium gas within the bulb.
What happens if you use a mercury source instead of sodium vapour lamp in diffraction grating experiment?
sodium vapour lamps produce much higher light output (about 90 lumens/watt) they cannot be used in lighting applications where colour-rendering property is very crucial. This is because most of the light emitted from a sodium vapour lamp is concentrated in the yellow part of the visible spectrum (around 580-590 nm) On the other hand, a mercury vapour lamp is quite suitable for lighting applications. This is because, the mercury vapour lamp can feed almost the entire visible region (380-780 nm) of the human visual system.
Principle of working of a sodium vapour lamp?
In a low pressure sodium vapour lamp, argon or neon gas is first heated up to emit a slight red or purple glow. The heat from this warms sodium metal in the light to the point of vaporizing, which is when the familiar yellow glow begins.
Why a sodium vapour lamp gives pink colour followed by yellow?
This could be due to the fact that a sodium vapour lamp contains neon gas and when a current is passed through the two electrodes in the lamp the neon gas becomes ionised and shines red until vapourisation occurs and the sodium cause the typical characterised yellow.
Will mercury vapour work in a sodium vapour fixture?
no
Why argon and neon gas used in sodium vapour lamp?
Argon gas is used in sodium vapor lamps to provide the starting mechanism for the lamp. When the lamp is turned on, the argon gas helps facilitate the initial discharge of electricity through the lamp. Neon gas is used to help improve the color rendering of the lamp, making the light emitted appear more natural and pleasant.
Why sodium vapour lamp are used as street lights instead of simple white tube lights?
Sodium lighting is more efficient to run than white lights, and it gives an even light with less glare.
How bright is 950 lumens?
220 lumens is equal to a tungsten incandescent light bulb of 15 watts. Halogen lamp 20 watts. Fluorescent lamp 60 watts. LED lamp 60 watts. high pressure sodium vapour lamp 117 watts. Mercury vapour lamp 50 watts or 17.32 candle power
Can you use a 400W high pressure sodium bulb in a metal halide ballast?
No, the ballast has to be matched to the lamp. 250 watt ballast, 250 watt lamp. Also be sure to match the lamp type to the proper ballast even though the wattage is the same. HPS ballast to HPS lamp, Metal halide ballast to metal halide lamp and mercury vapour lamp to mercury vapour ballast.
