Each strand comes with 12 LEDs, approximately 5cm/2 inches apart for a 2 foot long strand of wire. At one end of the magnet wire, a double stranded-core wire is soldered on and heat-shrinked to protect it. A 2 x CR2032 coin cell holder with on/off switch is on the other side. Of course, if you want you can just cut the coin cell holder off and solder on a 3xAAA battery holder or 3xAA battery holder. To solder to the magnet wire, scrape off the coating first.
Requires 2 x CR2032 batteries to run. Does not come with batteries, we do stock CR2032 batteries if you want to use them as is. Runs for about 8 hours continuously on two CR2032’s.
Please note: There are no series resistor installed in the strand, if you want to use another supply you will need to calculate and solder in a resistor. The reason that two 3V coin cells can be used to drive LEDs with a forward voltage of about 3.2V is that coin cells have an internal resistance that makes up for the lack of a choke resistor. If you want to drive these via a 6V power supply, you’ll want to put in a 20-220 ohm (or larger) resistor in series to avoid burning out the LEDs. If you want to use a 4.5V power supply, use 10-100 ohms (or larger).
- LED strand is 26 inches (660mm) long, LEDs are spaced 5cm/2″ apart
- 1000mcd brightness per LED, Forward voltage of 3.2-3.4V @ 20mA
- Connecting wire is 8 inches (203mm) long
- Battery holder is 2″ x 0.9″ x 0.22″ (51mm x 23mm x 5.6mm)
- Weight without batteries: 6.44g
- Weight with batteries: 12.44g