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Author Topic: Bulb for PCB exposure  (Read 2073 times)

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ltodd2

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Bulb for PCB exposure
« on: November 13, 2012, 15:21:32 PM »
Hello all.
Im new to this forum so may have posted this in the wrong place.
Im wanting to design and etch my own PCB's and have been given a metal halide lamp.  Do these give out enough UV to expose the pcb?

Many thanks

Lee

kam

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Re: Bulb for PCB exposure
« Reply #1 on: November 13, 2012, 15:37:33 PM »
Hello lee,
i used to use such a lamp years ago, i had one 150 Watts. It was actually more than enough! The exposure took some 2 minutes from about 30cm distance.

ltodd2

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Re: Bulb for PCB exposure
« Reply #2 on: November 13, 2012, 19:41:15 PM »
Kam

What type/make of bulb did you have?  Im only asking as I spoke to the manufacture of the bulb and they said the output of UV was about 4% which made me think is this going to work.

thanks
Lee

kam

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Re: Bulb for PCB exposure
« Reply #3 on: November 14, 2012, 09:19:10 AM »
Almost impossible to find this lamp again. If you have this lamp then go for the test, if you don't just get a UV lamp instead.

ltodd2

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Re: Bulb for PCB exposure
« Reply #4 on: November 14, 2012, 14:30:14 PM »
Thats one thing im not sure on.  There are a few types of UV tubes that I have seen ie blacklights, fish tanks, sun tan etc.  what kind do I need?

Lee

cheerio

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Re: Bulb for PCB exposure
« Reply #5 on: November 14, 2012, 20:26:12 PM »
i use 4 uv tubes salvaged from a sun tan device. i put them in an old scanner case.

_pike

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Re: Bulb for PCB exposure
« Reply #6 on: November 15, 2012, 08:35:42 AM »
You can also use uv power leds have a look on ebay you can find douzens......



edit:   
My exposure box has one of it too....But these lamps are obsolete comparing to leds...They consume much power (mine is ~1000w) and i have been told that thay produce radiation...(don't know if thats true.)If you need info for the box i will post a schamatic of my box.But my opinion is to use leds....
« Last Edit: November 15, 2012, 08:43:08 AM by _pike »

kam

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Re: Bulb for PCB exposure
« Reply #7 on: November 15, 2012, 23:44:01 PM »
... which now reminds me that i have some new UV LEDs to test... and still have not.... hmmmm....