I ordered two and they both arrived today. I put the first one in a 3D and thought it looked darn good. The ambient light in the house through the blinds was still pretty bright but I could tell I'd probably be happy when night time fell.
I put the 2nd on in a 4D and compared the two side by side....they looked to have identical ouput?? I then removed it and put in into a second 3D and the output didn't change. That was surprising to me. I though the SCC P4 on 6 volts would be noticable brighter. That's ok though. I prefer the size of the 3D and I was happy that I wasn't missing out by having it in a shorter light.
I just came in from outside and these thing throw like crazy. It's probably only sencond to a mag LED with custom optic. At first I was skeptical about the 120-140 lumens claims, but the center spot is so hot and the spill decent enough that I don't doubt the claims. I'm really enjoying these things so far.
All of my MagLEDs have UCL lenses and I can actually see the difference in superiority between the UCL and stock lenses when comparing side by side. I believe it's close to a 10% increase in light transmission according to a CPF member who metered the difference.
Sorry that you're having trouble with your new drop-ins but I know that Matt will make things right for you. I'd give terralux a second try. For the money, they're pretty hard to beat.
I think I'll post a review of them this weekend.