Computers are just heaters that do maths as a side effect, so it makes sense. There’s even a company monetising the idea for ESG credits
Two issues i can see are
- Humidity in a grow room will be bad for a computer
- With modern computers the heat output will in part depend on the workload, so you will need to find a way to make the computer do more work when you want more heat.
So it just changed colour like that when you shot it with the laser without any other work? I assumed it was hot foil stamped when I first saw it.