Hacked Gadgets Forum

March 3, 2012

Transforming a Hg Lamp into a powerful UV Light Source

at 10:15 pm. Filed under Electronic Hacks

 

Giorgos Lazaridis from PCBheaven has transformed a discharge mercury gas lamp from his workshop into a powerful UV light source. A UV lamp usually generates UV radiations that cause the internal coating of the surface to glow and produce light. If you have any discharge mercury gas lamp out there in your storage room don’t throw it in the garbage since you can follow Giorgos’s steps for changing it into a powerful UV light source.

“It looks like UV to me! I mean, the lamp originally had a very bright cold white light. Now that i removed the cover, the lamp glows a dark violet color. I only had to re-try cure the UV paint and see the results. So, here are the results: Before i break the glass, with 10 minutes of exposure from a distance of about 30cm, the paint did not cure at all. With the glass removed, from a distance of about 10cm, after 10 minutes of exposure, the paint cured completely. As a matter of fact, the board was over exposured under UV and some paint was cured even under the mask. The difference is obvious. This means 2 thing:

  • 1: By removing the glass, the UV radiation is radically increased
  • 2: I have to find out what consequences will have the broken glass on the lifespan of this bulb”.

 


 

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8 Responses to “Transforming a Hg Lamp into a powerful UV Light Source”

  1. Shadyman Says:

    I’d imagine the biggest risk would be that it cools down too fast and suffers thermal shock.

  2. dave96z34 Says:

    was going to say that contaminates getting on it from open air.

  3. Nah Says:

    “So, here are the results: Before i break the glass, with 10 minutes of exposure from a distance of about 30cm, the paint did not cure at all. With the glass removed, from a distance of about 10cm, after 10 minutes of exposure, the paint cured completely”

    Test is useless since the distance wasn’t the same in both tests.

  4. Per Jensen Says:

    There is no risk involved using the bulb without the outer glass, other than the risk of being electrocuted witt the bare components. BE AWARE that the UV is very dangerous! – It hurts your eyes and skin and causes skin cancer. The outer glass blocks the harmful UV because it is made of ordinary soda-lime glass. The discharge bulb inside is made of quartz-glass, which passes all the UV-radiation.

  5. Cliff Says:

    Note that modern-day MV bulbs have a special “fuse” inside that kills the lamp when the outer envelope is broken….

  6. Tachikoma Says:

    Most of the UV was not blocked by the glass, rather, it was down-converted to visible light by the phosphor coating.

  7. Smashing bulbs to make UV lights - BuildLounge » BuildLounge Says:

    [...] via Hackedgadgets. Share [...]

  8. Rixx Says:

    I use bulb like this for PCB exposure. About one minute from about 20cm away and its done. It is VERY powerful, I close the room and switch it on/off from outside. I take care not to touch bulb with bare hands so it won’t get greasy.

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