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Topic: Photo Emulsion Lightbulb  (Read 3709 times)
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madam_mim
« on: January 04, 2008 11:21:07 PM »

I had a few questions concerning the light bulb I purchased to try the photo emulsion method of silk screening.

I got a Speedball Silk screening kit for Christmas, and it recommended a BBA No. 1 Photoflood... which doesn't make much sense to me, but I assumed it was a 250W Photo bulb.

So, I purchased a General Electric 250W 4800 Kelvin Photoflood Lightbulb.  I was told by the gentleman at McBain Camera that this is the coolest burning photoflood that they sell.  However, the light bulb is blue, and I was wondering if that will affect the exposure time at all?

The caution on the back of the lightbulb also scared me, it states that I should keep myself, and all articles at least 4 feet away from the lightbulb whenever it's turned on.  But my kit tells me to hang the light 1-2 feet above my screen.  Do all photoflood bulbs have warnings like this?

Thank you in advance for any advise you can lend me.  Smiley
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gius
« Reply #1 on: May 11, 2008 07:09:33 PM »

So far the ones I've seen don't have warnings like that. I can't answer your question, but I wonder if it gives off some kind UV rays (like sunlight), so maybe that's what it means?  Huh
I think the only thing you can do is test it to see if it will expose the screen.


---------

New question...

I'm going to post another lightbulb question here...

There are so many kinds of bulbs. Incandescent, halogen, fluorescent. Does it matter? Which is better?

I bought a halogen 150 Watts.
I haven't found a lamp that is for a 150 watt bulb. I've only seen really tall lamps for that, but they are way too expensive (and also too tall for screen printing).

I was told a reflector is good to have to spread out the light. All the reflectors I've found at the store are less than 150 watts. Is a floodlight the same as a reflector?

Not really sure how to solve my problem
I did find a reflector with no recommended wattage and bulb type.
This is what the reflector lamp says:
Quote
5 1/2-in. reflector. On/off switch. 1.85-m. cord. (Lightbulb not included.) Black.
So I am thinking I could just put my halogen bulb in that.
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dawn0684
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« Reply #2 on: July 26, 2008 08:23:45 AM »

my light has the same warning on it, it's because it gets really hot when it's been on for like 10 minutes. i actually use a 500w bulb for 12 minutes. since i dont have a stand for the light yet i just hold the thing by the handle about 24" about the screen. just have to make sure how to touch any other part of the light because i'll get burned.
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