Low Pressure Mercury Vapour Lamp Diagram

Two varieties of such lamps exist.

Low pressure mercury vapour lamp diagram.

Amalgam lamps use a mercury amalgam mix to control mercury vapor pressure. One would tip the lamp and electrical contacts on each side of the lamp would send electricity through a liquid mercury which started the lamp. This coating covers more than 70 of the diameter of the lighted length of the lamp. The aperture phosphor coated lamps that jelight company produces employ the same basic design as the double bore low pressure mercury vapor lamps with the exception of a special phosphor coating.

The lamps can be constructed to emit primarily in the uv a around 400 nm or uv c around. In low pressure mercury vapor lamps only the lines at 184 nm and 254 nm are present. Rather than a cold spot the lamp s amalgam spot on pellet regulates mercury vapor pressure during operation and yields up to three times the uvc output of a standard low pressure mercury lamp of the same length. Fused silica is used in the manufacturing to keep the 184 nm light from being absorbed.

As pressure increases the chance of multiple collisions gets increased. Again transition of the electrons requires least amount of input energy from a colliding electron. A sodium vapor lamp is a gas discharge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589 nm. In medium pressure mercury vapor lamps the lines from 200 600 nm are present.