To friends here who want to upgrade laser power supply and tubes after some time using:
Tip 1: As for the power, not the larger the better. Power larger than 100W can not engrave well.
If your work is only cutting, then it is helpful if you upgrade so that you can cut thicker material and have faster speed.
If your work is only engraving, the best power will still be around 60W.
The best point for both work at the same time will be 60W-80W/Reci W2.
Tip 2: The larger power supply can give power to smaller tube but not vice versa.