Circadian Friendly LED Desk Lamp (no Programming Required!)



About: Autistic person who's interests include utility cycling, recreational cycling, cycling safety, electronics, gardening, Arduino, and LEDs.

This lamp is circadian friendly. At night, it shouldn't keep you up because only the warm coloured LEDs can turn on. During the day, it can make you more alert because both the both the cool white and warm coloured LEDs can turn on. It has both ambient and workspace lighting. Since it relies on an outlet timer to select enable and disable the white LEDs, you don't need programming or a real-time clock!

Step 1: Materials

  • Outlet timer
  • 2 - 12V 2A power supplies
  • 8 - red or yellow LEDs
  • 6 - cool white LEDs
  • 4 low dropout LED drivers such as dan's LED drivers
  • Heatsinks
  • 2 - 2.1mm conectors
  • Cookie box
  • Diffuser
  • Double pole switch

Step 2: Drill the Box

Drill the box for the switches, wires, vents, screws, and cable ties.

Step 3: Cut the Cover

The dimensions of the cut also depends on the desired cutoff of the beam. Make sure the margins are large enough for the diffuser which can be made from frosted materials.

Step 4: Switch Wiring

This was wired so that you can switch the lamp while it's connected to two power supplies. The power supply for the white LEDs will be connected to an outlet timer and the other will be always powered.

Step 5: LEDs Wiring Configuration

Red and yellow LEDs were used for the warm colours with a configuration of 4S2P. One string was in the box to light the work area and the other was outside pointing up to light the ceiling and walls for ambient lighting.

The white LEDs had a configuration of 3S2P. Just like the warm colours, one string was in the box and the other was outside. The difference was that the white LEDs inside was higher so that its beam cutoff was easier to make.

Two drivers per power supply were used.

Step 6: Cable Tie the Wires

Step 7: Setting the Timer

Set the timer to enable and disable the white LEDs at your preferred day and night times respectively. For example, the outlet may turn on at 6am and turn off at 6pm. If you're working nights, you may prefer the opposite or somewhere in between depending on your work schedule.



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