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Signing UpStep 1What you need
2. Plastic water bottles (0.5L) - thinner plastic = better for this project
3. Spray paint/acryllic paint
4. Painter's tape
5. Red LEDs - 20mA at 3V
6. Battery holder + 3 AA batteries
7. Wire
8. Solder and soldering Iron,
9. Wire cutter
10. Super Glue
11. Some pointy tool to punch holes.
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How many hours are you getting out of 3 AA's though? AAs are about 3000 mAh, but your 40 LEDs draw 40x20=800mA - so less than 4 hours?