400w Mercury vapour lamp ignition, run & hot restrike.

Start, run up and hot restrike of a G.E.C clear tubular mercury vapour lamp. Quite rare to find clear mercury vapour lamps but they are still available in the US and Japan. The lamp takes about 5 minutes to reach full output and if the arc is interrupted the lamp must cool down for about 7 minutes before the pressure in the arc tube drops low enough to re ignite.
22,000 lumens, 5800'k colour temperature and a life of 20,000 hours.
The hot restrike section of the video is a good demonstration of the starting electrodes used in these lamps.
When the lamp is energised the distance between the electrodes is so large that the full open circuit voltage is not high enough to cause ionisation of the gas filling. However the same voltage is also applied to an auxiliary starting electrode via a small resistor. The gap between these electrodes is much smaller, and the voltage gradient is sufficiently high that ionisation will occur. A small discharge strikes and once free electrons, ions and photons have been produced in the arc tube it is then very easy to strike an arc across the main electrodes. The discharge quickly makes this transition because it can then bypass the starting resistor, as there is no electrical resistance between the main electrodes.

[@garfield12344]

I think they are produced like that clear bulb in UK in Eastern Europe are available only oval shape and fluorescent coating, or black light coating rarely clear glass... I wish to have one in collection... But no one sells it in Romania... Not even produced except fluorescent ones, In this Green Deal craze with LED lights... I love them too... But thes HID are capable to take electric surges much well (grid failures, EMP dolar coronal discharges...) I se on KZbin a test of a 80w driven til 2000w shortly then blowed up... LED cannot resist to that....

[@kadzukilucifer5917]

ooohhh! like green light! :)

[@theodorm.6848]

very cool stuff!

[@edwingerardocampossolis5487]

Oh My Good Very Beautiful :-* O:-)

[@ChumpusRex]

Very nice.

[@КостяКостя-я7п]

👍💡400🌙

[@КостяКостя-я7п]

костя💡👍

[@gajanangurav6289]

Tube ka Prize kitana haii green color ka

[@bareddy3944]

how much

[@fahrulfahri8423]

Di jual di mana lampu ini

[@frank9240]

(THAT'S REALLY A COOL-ASS TYPE OF THING TO BE INTERESTED IN.........(I specialize in toilet float technology).......

[@yousufwasil7815]

Say something

[@xavier4563]

No

[@electroimpex8897]

Really nice