Re: G.Weike LG900N or LC6090
A 80 watt is a good all around machine, or even a 60 the 50 watt machines on eBay as everyone has found out by now are just barely a good 40 watt or less. The venders turn up the power supply to get something close to 50 watts but it burns the tube out and when you go to replace you will find out all about wattage, power supplies and tube length!
A Chinese machine with a glass tube and stepper motors will never be as fast as a RF machine from a US maker, or a Trotec which is the speed king for engraving at high speed. But very pricey.
When you go to large on an engraving machine, the dot size is somewhat larger and you have issues firing the tube at low wattage needed for some items. It may or may not fire depending on the tube and HV power supply. If your just going to cut, go for more power and forget engraving on wood, glass, acrylic, and Corian, You will just burn. YMMV.
Retired Master Electrician, HVAC/R Commercial. FLA Saturn 2 4x4 CNC Router Mach4 Kimber 1911 45ACP