Quantity   Component name
12 × Sebson Media GU4 LED module (54 Eur) [check] http://www.sebson.de/g4-led/led-g4lt-smd12/a-110/
12 × Ikea KALAS plastic cup (4 Eur) [check] http://www.ikea.com/de/de/catalog/products/10192956/
1 × old used solar panel (for free) [check] approx 20-25 V idle
1 × old used car battery 35Ah (for free) [waiting for it]
1 × 20 meters 2x 0,75mm cabling (8 Eur) [check]
2 × BC547B [check] Discrete Semiconductors / Transistors, MOSFETs, FETs, IGBTs
2 × Zener Diode 5.1V [check]
2 × L-formed steel shelf angle (16 Eur) [check] used to mount solar panel
1 × screws, solder, .... small stuff [check]