Hi. I'm an absolut beginner into electronics. I'm an artist and have built a box (32" X 32" and 15" in height) which is divided into 6 environments. I want to light each environment individually with LEDs. I have bought some 5mm and 3 mm LEDs and a transformer (6 to 12V, 2.5A). I don't know exactly how many LEDs I will need until I can test them in the box.
How can I build a circuit that is not permanent so that I can test different light combinations? What components do I need and where do I get them? Thanks!!