Hello, The majority of Photoresist materials both positive and nagative are very much resistant to the usual artificial lighting, they require a specific wave length to activate [UV], there is a small percentage of UV in daylight tubes and bulbs so it would be advisable not to take too long when preparing a board for exposure otherwise no special considerations need to be taken, except don't do it outdoors in the sun!! regards, David [Non-text portions of this message have been removed]
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Re: recommend a dark room light
2012-10-07 by D. Gareth Hughes