Ljusmaskinen: a portable light rig attached to a backpack #Video

Ljusmaskinen is a portable light rig attached to a backpack. It’s got 4x4W RGBW spots and 4x10W COB LEDs mounted on a rig made out of aluminium profile. The chassis is build up of 2020 aluminium profile and can be folded to take up less space when transporting.

I went with a little unusual LED driver for this build. Since this is a battery operated product I didn’t want to limit the current with resistors and loose a lot of effect on them. Especially since effect of the LED is 1W per color channel.

I decided to limit the current consumption of each color of the LED by supplying it’s forward voltage from a buck regulator. By simply adjusting the voltage in the buck I could trim it to around 200mA per channel.

The extra potentiometers in the bucks would also give me the option of adjusting each color channel separate. That made the color calibration of the light so much easier.

See more at Tim.Gremalm.se


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