As diffusers, ping-pong balls are economical and they’re effective. But you know what else they are? An inconvenient size! An LED strip with 30 LEDs per meter puts individual LEDs about 33 mm apart.

I originally planned to buy ping-pong balls from the dollar store but they only had six 9-packs. I ended up ordering a gross online. I drilled a hole in each ball for the LED to stick through ...