I also made this project after your example (however i had to etch the boards my self, little bit hard from these gerbers but any way:-))
It worked nice but after a little longer session with a 12v 25w lamp the current control started to oscilate and be unreliable when i was testing.
Any ideas about where to start. I am not an expert so thats why I am asking.
The only thig i have tried so far is ro replace the tle op amp but same result.
Attaching some pictures of my project as well.....
And yes i realise that a cooling fan is needed:-)
Ok so now solved:-)
Now it works like a charm again and the problem was that due to a tight layout i had a small pice of aluminium on the backside of the board between two thin lines. (it did not burn anything so lucky i guess).
Just have to find a good way for the cooling fan.