LED uplights with dual colors

From CaveLab
This page is kept for historical interest. It may document projects or methods that are obsolete and/or no longer relevant. The information here is not kept up-to-date.

These lights were taken down when I moved out of my first apartment.
White and black light, on wall.
Four lights on wall.

Four LED uplights, each with three LEDs; two bright white and one UV/red.


In my old apartment I built four of these uplights and mounted them on my living room wall, in an upward line. They didn't really produce that much light, but it gave a cool effect on the wall. Especially the white and UV together kind of looked like a propane flame. Powered by: 5V.

I experimented with different colors in the center; red was also very cool. In the parts list there are both UV and red LEDs, with appropriate resistors.

Read more about how to calculate the required resistor for an LED here: LED Resistor Calculator.

I controlled the lights and colors with a home-made controller: Electronic switch with 4 channels and voltage regulator


Parts list

UV = 100 Ohm
Red = 150 Ohm
Qty. Part
5 m Control cable, 4-cores, 0.25mm2, 250 V, Ø 4.6mm
4 × Enclosure, plastic (1551), 60x35x20mm
4 × LED 5mm clear, Red, 2.1V, 20mA, 7.000mcd, 20°
4 × LED 5mm clear, UV, 3.4V, 20mA, 2.000mcd, 25°
8 × LED 5mm clear, White, 3.1V, 20mA, 25.000mcd, 15°
12 × LED holder 5mm, RTC51, black plastic
4 × Resistor, carbon film, 0.25W, 100 Ω, 5%
8 × Resistor, carbon film, 0.25W, 120 Ω, 5%
4 × Resistor, carbon film, 0.25W, 150 Ω, 5%