So I have been through the wringer with this JQ-60-1390 laser (60 as in 60 watts) I have replaced the bulb, power supply, pulleys, belts, and lenses. I have aligned and realigned, calibrated, uncalibrated, recalibrated. I have tried different image settings and processing styles, and even used files from outside sources in an attempt to remove myself as a variable.

Ultimately, I believe the issue somehow relates to the water chiller (cw-5200) and/or the temperature of the laser tube. The horizontal lines correlate perfectly with the cycling of the water chiller. As I lower the temperature on the chiller and increase the rate the condenser is working, the lines will become closer together.

I will follow this thread closely and be happy to answer any question I can. This problem has gone on for years.