If ( as I occasionally do ) I run the freeware program " Laser GRBL ", the laser is fine, and power adjustment works as expected. But After the last update ( or perhaps after I purchased Lightburn at about the same time) the laser output power is very low,
If I revert to using the freeware LaserGRBL, the laser (and power control) work as expected. The latest update to Lightburn version 17 ( today ) has not rectified the situation 
… any idea what I can check within Lightburn ?
Run LightBurn, draw a square, set the power and speed for cutting it out, click ‘Save GCode’, and then attach the saved file here so we can look.
That should tell us very quickly what’s different between LightBurn and LaserGRBL.
The most common reason is having speeds set to mm/second instead of mm/minute. If you set the speed to “3000”, and aren’t paying attention to the units, 3000 mm/sec is really fast, and wouldn’t leave a mark. 3000 mm/minute is 50 mm/sec.
Can’t get the file of the PC at the moment ( an Outlook issue ), however … opening it with notepad shows cut@ 6000mm/min, 20% power .
Where are those attributes set ?
Got the G code :
; LightBurn 1.7.01
; GRBL device profile, absolute coords
; Bounds: X30 Y70 to X50 Y90
G00 G17 G40 G21 G54
G90
M4
; Cut @ 6000 mm/min, 20% power
M8
G0 X50Y70
; Layer C00
G1 X30S200F6000
G1 Y90
G1 X50
G1 Y70
M9
G1 S0
M5
G90
; return to user-defined finish pos
G0 X0Y0
M2
6000 mm/min at 20% power is just the default setting in LightBurn. Are you not setting your speed and power values?
This is the most basic place to set them:
If you double click either of these spots, it opens up the Cut Settings Editor window where you can change more of the settings:
Thank you - I was not setting speed or power - I get it now, these are set by Layer ! Mystery solved.
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