I had arcing all over my 100w Morntech. I know it's a different brand, but the same sort of cheap Chinese knock off. I had arcing in a couple of spots. I eventually rubber lined the box the tube sits in with a sticky backed rubber flashing underlayment. Then I put silicon on the leads to the AMP meter, and on all the connections throughout the machine. What I found was that the wiring was not sufficiently covered and protected from arcing in about a half dozen places. The wires connecting to the bulb were only one thing to solve.
100W 24"x36" Morntech laser, 4"x5" Betterlight digital scanback camera
Corel X5, Macs, PCs, Illustrator CS5, PS CS5, more software than we care to mention here.
Two Epson 9900 giclee printers - Bellevue, WA