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^Yeah, I read that bit but I saw a homebrew lava lamp, (I think it was on here. Did TJ post it?), that used a low watt bulb and diluted liquid soap for the convection effect.
That was a cloud lamp, and I'm still gathering parts. I found a huge glass cylinder (36" tall, 12" diameter) and am waiting for the blue LEDs to arrive from China to give the water a blue tint, like the sky. I might add a spinning magnet to the bottom to make a tornado lamp. Not sure if I can add a laser to it, :thinking: but obviously I will try. :eg:
Nice work Jan, and good idea Dave. You can pick up used lava lamps for ~$5 at any local flee market.