Thermal Flashlight scaling help
I'm dont have much basic knowledge about electronics and I got a problem.
I've built this exact Instructable: https://www.instructables.com/id/Build-a-Thermal-Flashlight-Light-Painting-with-T/?ALLSTEPS
I want to drive a 1m RGB LED strip with it so I've changed the NPN transistors to stronger ones that handle 0.5 A, it's the only components that are different. These are the exact NPN transistors: https://www.elfa.se/elfa3~eu_en/elfa/init.do?item=71-014-58&toc=0&q=BC337-25
Problem: the circuit works fine with ONE RGB LED but it does not work with even the smallest bit of RGB-strip (3 emitters). Goal is to drive a 1m strip and that consumes 14.4W @ 12V. Im using 12V 1A adapter for the Arduino and another 12V 2.5A for the LED-strip.
What am I not understanding?