About 5000 volts.
Additional Explanation of this answer
While the "Striking Voltage" of the Bulb may be 5,000 + volts the bulb actually operates on much less. More like 120V or 200V. If you continued using 5,000 V the bulb would rapidly burn itself out.
The striking voltage is much like a Florescent bulb. The higher voltage is to cause a spark between the gaps or electrodes to ignite the gasses within the bulb regardless of Florescent , High Pressure Mercury or any similar bulb, then the voltage lowers to keep the bulb lit. This is exactly the reason they need a Ballast, Starter or similar device to start the bulb
Hopefully this answer helps others
We decided to edit the other persons answer to further explain and to help avoid and injuries or damages caused by improper voltage
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The lamp needs to be rated for the voltage applied to it. The fixture in which the lamp is installed also needs to be rated for the voltage. So, it is not a matter of changing the lamp, it is a matter of having the fixture and lamp that are properly rated for the voltage that you are applying to it.
the supply voltage to a mercury vapour lamp (from the electromagnetic ballast) is 130vac
because fluorescent lamp consume least voltage than incondescent bulb.
The answer is possibly. There is no guarantee that the insulation designed for the lower voltage will be adequate at the higher voltage. The danger of electric shock should not be scorned. The cost of a new lamp is not daunting, and if the lamp is an heirloom item, then that value should enable the wiring and switches be upgraded. Don't take chances.
In North America the common working voltage for household appliances is 120 volts. In UK and Europe the common working voltage for household appliances is 240 volts.
A Mitsubishi DLP lamp varies in price depending on the model it is required for and prices may be approximately $35-$40 with DLP lamps for different models being available on Amazon.
A DLP lamp may need to be replaced because it may have become faded or have burnt out. DLP lamps are often used in HDTV, LED and LCD televisions for picture quality.
A Mitsubishi DLP lamp is the Mitsubishi brand of digital light processing lamp used in rear-projection tvs and projectors. It supplies the light necessary to make the projection.
The DLP lamp is a light function that works with a mirror function that creates different light aspects and ratios. The DLP can only be co-ordinated with a digital video or graphic signal to work as it was intended by the manufacturer.
Toshiba DLP lamps are energy costly to have and use, because they have to be replaced fairly often. More information can be found here: http://www.ehow.com/how_7206948_change-lamp-toshiba-dlp-tv.html
A DLP lamp is used to power what is seen on a rear-projection television, and is also used in modern color digital projectors. Digital cineman projection also used DLP technology.
The samsung dlp lamp comes with the type of warranty any other lamp of it's kind comes with. First if there is a problem I'd try returning it to the store. However buying the warranty better yet the extended one is not a problem because if anything goes wrong you will be supplied with a new lamp.
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DLP stands for digital light processing, these are mainly used in projectors. A Sumsung lamp is obviously used in Samsung products and can be sourced in any Samsung dealer or from Samsung direct. Always used samsung recommended dealers.
The lamp needs to be rated for the voltage applied to it. The fixture in which the lamp is installed also needs to be rated for the voltage. So, it is not a matter of changing the lamp, it is a matter of having the fixture and lamp that are properly rated for the voltage that you are applying to it.
Projector televisions require lamps which occasionally can burn out. Replacement lamps for many popular models of televisions including Panasonic and Sony can be found online at the DLP Lamps website.
The Benq replacement lamp is used to replace the lamp of a projector. If your projector lamp breaks or simply dies (it does after typically 10-15 years). You can replace it with a Benq lamp. The Benq lamp is only for LCD and DLP projectors.