"Parasitic" floor lamp #12: Lighting

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Blog entry by Ross Leidy posted 09-13-2021 01:53 AM 378 reads 0 times favorited 2 comments Add to Favorites Watch
« Part 11: Box glue-up Part 12 of "Parasitic" floor lamp series Part 13: Almost there »

My plan from the beginning was to use LED strip lights that I had left over from my office lighting project. The 4000K LED’s are “natural white”, but may end up too cool for this particular application. But, since I had them, I decided to give them a try.

I bought a transformer that was dimmable with an inexpensive 0-10v rotary dimmer, which will be mounted on the back panel along with an on/off switch. Here are the pieces hooked-up temporarily so I could see how the dimming worked. I’m most likely going to set-and-forget the dimming level, and I was pleased that it went pretty dim before winking out.

For mounting the LED strips, I made a frame to hold 6” sections of the aluminum track. I curved the front of the frame, hoping that the light would be brightest in the center and fall-off a bit towards the sides.

Here I’m just working out how high off the bottom the frame should be mounted. I set the height to roughly put the transformer centered vertically. The frame will eventually be mounted to the 1/4” ply back, which I’ve yet to make.

I cut the LED tape into ten 6” sections and soldered some jumpers between them.

I cut ten 6” sections of aluminum track and diffuser, drilled them for flat head screws, and mounted them to the frame.

With the LED strips and diffusers temporarily installed, I could do a test fitting in the box.

The fit was a little snug, so I’m going to file some relief notches on each end of the aluminum tracks so the wires don’t get pinched. The acrylic panel I ordered has 32% translucency, which I think is really going to work great. You won’t be able to distinguish individual LED strips when it’s only an inch or so away.

I’m not sure I’ll get the light fall-off at the edges with how the LEDs are currently placed, but I still need to check it out with the dimmer reinstalled. (All the lit LED pictures on this page except the first are full brightness.) If I decide that’s super-important, I’ll just try a different configuration. The light also seems a bit harsh, so I may be ordering some lower temperature “warm white” LEDs at some point.

2 comments so far

View Dave Polaschek's profile

Dave Polaschek

8288 posts in 1798 days

#1 posted 09-13-2021 02:05 AM

You could also get more fall-off by having shorter strips of LEDs at the ends.

Looks like it’s coming together nicely.

-- Dave - Santa Fe

View Ross Leidy's profile

Ross Leidy

279 posts in 3158 days

#2 posted 09-13-2021 11:47 AM

You could also get more fall-off by having shorter strips of LEDs at the ends.

Looks like it’s coming together nicely.

- Dave Polaschek

Excellent point. I like a simple solution.

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