LED Mood Light
(C) G. Forrest Cook 1999
Power this project from sunlight with a
solar power circuit board kit.
Other LED lamp circuits can be seen at
FC's LED Circuits,
another interesting LED project is my
13 Color LED Rainbow.
LED Mood Light
This circuit makes a nice lamp that consumes little power, runs cool, and has
an incredibly long lifetime. The lamp puts out a warm yellow shade of light,
the color may be adjusted by changing the number of red or green LED strings.
Operating Voltage: 12V DC
Operating Current: 80ma approx.
The current flows and the LEDs light. There are 4 series strings of LEDs
in this circuit, the resistors limit the current through the LEDs and prevent
them from burning up. The resistors were adjusted to get approximately
20ma through each string. Different LED colors will have different voltage
drops and resulting current flows.
These resistor values will work fine at 12V.
The circuit was mounted in a plastic 35MM photographic slide box
with a translucent plastic top (not shown).
A piece of perforated board was cut to fit inside of the slide
box, the LEDs and resistors were inserted through the holes in the board and
the wires were soldered together on the back side of the board.
It is recommended that you use a heat sink on the LED leads
while you solder them, it is very easy to damage an LED with a soldering iron.
A length of speaker wire was used to connect the lamp to the power source.
The circuit board was connected to the plastic box with one 6-32 screw
and several 6-32 nuts were used as spacers.
Connect this circuit to a 12V battery or power supply, it puts out a nice
glow that won't affect your night vision too much.
You can read by this light if you use it at close range.
10x green LEDs, T1-3/4 size
9x red LEDs, T1-3/4 size
3x yellow LEDs, T1-3/4 size
2x 100 ohm 1/2 W resistors
1x 56 ohm 1/2 W resistor
1x 62 ohm 1/2 W resistor (can also be 56 ohm, it's what I had on hand)
1x 1/2 Amp 28VDC fuse
1x Plastic box with diffused (blurry) top, I used a 35mm slide box.
1x 6-32 3/8" screw
2x 6/32 nuts
Jameco 1-800-831-4242 http://www.jameco.com/
Digi-Key 1-800-DIGIKEY http://www.digikey.com/
to FC's LED Circuits page.