Here's an interesting problem I'd like some ideas on. I've got an LPL C7700 and I ordered a new lamp for it (12V 100W) as I wondered if I could obtain higher max contrast in B&W with a new lamp. When I put the new one in it seemed dimmer than the old, especially fully open when focusing. I took a neg I'd printed before and used the same exposure. The paper was blank! At first I thought my dev was exhausted but remembering the dimness I tried again with the lens fully open. This time I got a good image. Contrast was no different from the old lamp, mind. But the odd thing is why should a new lamp be 3 stops dimmer than the old one? I checked and double checked I'd mounted it properly. Then I put the old one back in and the image was brighter. Dodgy lamp? Is there some brightness grade on these things I'm missing? Any ideas?