is xenon lamp are dimmable

Discussion in 'The Projects Forum' started by embpic, Jul 19, 2014.

  1. embpic

    Thread Starter Member

    May 29, 2013
    187
    3
    Is xenon lamp of 300W are dimmable???
    I have searched lot but not not found result.
    wether it is possible to dim the xenon lamp??
     
  2. Experimentonomen

    Member

    Feb 16, 2011
    331
    46
    No a xenon lamp(gas discharge type) cannot be dimmed.

    A halogen incandescent can be dimmed but it dramatically shortens its life time as the halogen gas inside reacts with the tungsten filament and redeposits the material that burns off, when dimmed this process cease to work and the filament deposits itself onto the inside of the glass bulb.
     
    embpic likes this.
  3. paulktreg

    Distinguished Member

    Jun 2, 2008
    611
    120
    Medical light sources use a rotating disk that dims the light by varying the density of small holes around the disk and thus changing the brightness as it it rotated.
     
  4. embpic

    Thread Starter Member

    May 29, 2013
    187
    3
    Thank you Experimentonomen & paulktreg.
    Is it possible to achieve that much intensity with LED.
     
  5. bertus

    Administrator

    Apr 5, 2008
    15,647
    2,346
    Hello,

    Looking at this 300 W xenon lamp like in the link:
    http://www.alibaba.com/product-detail/High-quality-GE-Xenon-medical-lamp_685740728.html
    There is stated that the light output is about 6000 lumen.

    When I compare that with the led module in the following link:
    http://www.digikey.com/product-detail/en/JDHT-ALK36-A1450-803-S02-NSA/1503-1016-ND/4755445
    There is stated that the light output is about 6400 lumen.

    There are even COB led modules witha higher intensity:
    http://www.digikey.com/product-detail/en/JDHT-ALK36-A1450-803-S02-NSA/1503-1016-ND/4755445
    There is stated that the light output is about 11000 lumens.

    Bertus
     
  6. THE_RB

    AAC Fanatic!

    Feb 11, 2008
    5,435
    1,305
    The xenon bulb itself can be dimmed, you just drive it with less current. I've driven one with AC from the secondary of a small SMPS step-up transformer, and was able to get any brightness level I wanted by varying PWM, varying the output power of the little AC transformer.

    At lower brightness levels the arc will be very unstable inside the xenon tube, and runs around on the inside tube walls. It can actually be quite beautiful, with a flickery candle type effect.

    But I have a feeling that a "300W xenon lamp" has driving electronics inside, so there will be big issues trying to dim it. You might be able to dim it a little bit, or it might not work at all.
     
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