Vacuum Tube LEDs: Bowl of Fire Floodlight

Although I didn’t plan it like this, the shape of the first doodad on the mini-lathe reminded me that I really wanted something more presentable than the (now failed) ersatz Neopixel inside the ersatz heatsink atop that big incandescent bulb.

So, drill a hole in the side:

Ersatz aluminum heatsink - drilling

Ersatz aluminum heatsink – drilling

Epoxy a snippet of brass tubing from the Bottomless Bag o’ Cutoffs into the hole:

Ersatz aluminum heatsink - tubing trial fit

Ersatz aluminum heatsink – tubing trial fit

Recycle the old wire and PET loom, solder to another fake Neopixel, blob epoxy inside to anchor everything, and press it into place:

Ersatz aluminum heatsink - epoxying LED

Ersatz aluminum heatsink – epoxying LED

Cutting the failed LED & plastic heatsink off the wire left it a bit too short for that tall bulb, but some rummaging in the heap produced a 100 W incandescent floodlight with a nicely pebbled lens:

Reflector floodlight - overview

Reflector floodlight – overview

A thin ring of clear epoxy secures the ersatz heatsink to the floodlight:

Reflector floodlight - finned LED holder

Reflector floodlight – finned LED holder

This time, I paid more attention to centering it atop the General Electric logo ring in the middle of the lens, which you can just barely see around the perimeter of the aluminum fin. By pure raw good fortune, the cable ended up pointed in the general direction of the socket’s pull-chain ferrule; you can’t unscrew the bulb without tediously unsoldering the wires from connector atop the knockoff Pro Mini inside the base and squeezing them back out through the ferrule.

With the firmware set for a single fake Neopixel on pin A3 and a 75 ms update rate, the floodlight bowl fills with color:

Reflector floodlight - purple phase

Reflector floodlight – purple phase

It puts a colored ring on the ceiling and lights the whole room far more than you’d expect from 200 mW of RGB LEDs.

Pretty slick, even if I do say so myself …


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