I agree with what others have posted, in that I think its the manufacturers like Streamlight, Surefire and Elzetta that need to get with the program. I bought a Sc600, and I'm surprised that the lens broke on your's(but not all that surprised). Its lens is pretty close to the end of the bezel, and now that I tap on it with my fingernail, it does seem a little weak maybe. But I dont think the Zebralight SC600 is the best "Ambassador" light to represent the toughness and overall quality of top end Chinese flashlights. Its way overrated IMO. Its not a bad light, its just not the end-all, best thing since sex that its been made out to be.
There are many really tough Chinese lights out there, and a few that I own are the Eagletac G25C2, the Jetbeam BC10, and the iTp A6, which is tough aside from its slightly weak battery carrier for its 6-AA batteries. I'm waiting on 2 Eagletac Titanium D25's(D25A and D25C) which should also be really tough.
But I was looking at Elzetta lights, and I think its a bit weak that they, Surefire, and Streamlight sell 1-18650 lights that only put out 200L or so. Some of the SF lights are only anodized to type II. The Lawman, made by SF costs an astounding $400+ for a 700L light! Some are plastic(polymer)...
Granted they are tough, but they should be, as much money as they cost! They also should be up to date with the technology, but for the most part they arent.
I'd rather buy a US made light, but until new US companies come out, or until the current lot of US companies stop price gouging while underachieving, I wont be buying them.......
The HDS lights are the exception, and I will buy one eventually, once they get on track with orders.