Is the noise from PSU or fans or laser diode head? And the image is pusating and flickering , is it in auto mode or controlled by laser software , QS or LD2000? If you project many points of images which the scanner can't bare, it also has flickering. If once you turn on the laser, it has this situation, it seems the green laser diodes needs some minute to be stable, I have two 8W green CNI here, at the beginning, it also has flicking problem in test. But after some minutes, it is ok.
So there are only two possibilities, one maybe laser diode problem, one is the image you project is with many points. If you can send us video, it is better for us to solve the problem. And both green laser diodes are from DHOM, if from CNI or laserwave, it is much more expensive, so if you want to make very high quality show, I suggest you use CNI or laserwave green, in most times, price and quality is in direct ratio. But what I can say is that our price is very better than other factories if in the same material, quality is better as well.
Usually cusotmers buy laser for beam show or graphic show, some requires high quality , some is just used in club, so if you can let me know what you use the laser exactly, we will give you good advice on this.
Please send video or some information in detail to Winni, we will help you to solve the problem asap.