Hey there, I'm now in possession of a Gralab 300 along with a bunch of other darkroom equipment that I picked up off of craigslist. While putting everything together I noticed that the timer had two power jacks on the side labeled "Safelight" and "Enlarger". So I plugged in both to the timer and tried it out. The safelight turns off when the enlarger is on. I actually found this to be incredible, it made me smile to go from a fairly bright red room to a very dark room with only the image seen on the easel and back again to the red. I've seen these timers but the only thing I thought they were good for was just keeping track of development times. Normally we'd use time-o-lites or those Gralab digital timers with the enlargers. I don't even think they "switch" the lighting sources like the Gralab 300 does. But the nice thing about them is that the timing is spot on for every exposure. I can see that with the Gralab 500, if you put the second hand on the five--it could be off by a half second if you take it too far or too little. Even if you're slow to take the hand to the five, it'll turn on the enlarger before you're done rotating the arm to it. So how do you guys make this work? Is it really a good device to time an enlarger with or do you suggest another type of timer?