I actually just had a pretty extensive back and forth with MaxSpect regarding the blue LED's in the G2's. Some of which I can talk about, some of which I can't, but I'll lead with saying that I was very happy with the conversation as a whole..... even if I am also in the group with problematic lights.
First off, regarding the burnt connectors on the 30w LED's. I had that problem too. Those connectors just aren't rated for that much power. Once I directly soldered everything down instead of using crimp connectors, they've been fine ever since. Just make sure to use some heatshrink tubing or something, as it's easy to short out those tabs. They did replace one faulty 30w unit for me about 6 months ago while still under warranty.
The blue SemiLED issue is something they are well aware of. I am also outside of warranty, so I didn't even ask for replacements. Usually, if your LED has failed, you will notice it DOES work for a few seconds when you power up. The problem apparently isn't the LED itself, it's the transistor on the LED chip. That transistor is designed to maintain the series circuit in case the LED fails. Ironically, it's the transistor that's failing, and cutting power to the LED. They did suggest a fix for it, which should restore the failed blue chips. I am going to try it and report back in the next few days. I don't want to give the details yet, just in case it doesn't work.
The blue LED's are also going brown on the chip because they are essentially at their rated limit. The 3w blue LED's are rated at 700ma, and they are being driven at 700ma, and they are getting hot as a result. I deal with this type of overheating all the time with other circuit board repairs I do. It's annoying, yes, but not unusual or anything to be terribly worried about. If it was getting hot enough to desolder the LED, then you should worry.
They also said the problem with the failing LED's is essentially limited to units with the SemiLED's. Folks who opted for the Cree units..... yeah, you spent your money well. Apparently those are not failing due to the different design.
We also discussed the design changes in future models as a result of all these problems with the G2's, these updates kick in with the Mazarra's and anything after that. First big change is that they went to all Cree LED units (which may be why the replacements are pricier?). The Cree's have the series protection circuit already built into the LED itself, and they have seen little to no failures of Cree LED chips. They are changing the cable connectors between drivers and led modules, so you won't see the corrosion problem anymore. They went with meanwell drivers in the power supply, which eliminates the problem with the failing driver modules from the previous supplier.
So, yeah, the G2's have been dissapointing for sure. But at the same time they spent a good amount of time communicating with a nobody like me, and I appreciated that. They also admitted the issues, and have what looks like a solid plan that should make anything after the G2's into rock-solid units. So I've got no problem buying from MaxSpect again in the future.
Now I just need time to crack my lights open again and test the suggested fix on the blue LED chips. I've got 10 of them that are bad right now..... didn't realize it until I did my last water change.
-Hans
(Oh, anybody NOT using their blue chips anymore? I'd love to snag a few spares to do some testing with if you can part with them.)