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  • Author Author: genebren
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Kitchen Lighting System Phase 2 - Part 2

genebren

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Previous post in this blog sequence:

Kitchen Lighting System Phase 2

 

One of my goals for this project was to increase the light output of the LED pucks.  I do plan to create some new lens, but first I wanted to look in the effects of using a collimator to direct as much of the light up through the lens.  I had started to play with this concept a while back, using a very simple design.

 

Here is my first attempt.  These were made of 3/4" PVC piping, cut down to the proper height, with a reflective mylar film placed inside the pipe (note: the PCB has 4 vias, with 30 gauge wire sections soldered in, placed around the inside diameter of the PVC pipe to help hold the unit in place until the PCB is attached to the housing).  The addition of this simple collimator did increase the light output by ~20% with the diffuser in place (974 Lux @ 10" after, compared to 804 Lux @ 10" before).  While I like the simplicity of this solution, I did create this prior to owning a 3D printer, so I thought I would try an update, attempting to improve the design with a simple cone-like collimator.

 

While the new collimator did increase the light output without the diffuser by ~5% of the simpler collimator, with the diffuser in place there was measurable change.  This must be due to the topside inside diameter of the collimator is actually larger than the diameter of the opening below the diffuser, so I believe that the added light output was attenuated by the aperture effect of the diffuser opening.  In the future, with a designed housing, I hope to work a little more on the collimator design, increasing both the slope and the inside diameter of the collimator and diffuser opening.

 

In addition to my attempts to increase the light output of the pucks, I also did a little work on my overall plan.  Initially, I had thought that I would use the 915 MHz version of RFM69HCW transceiver as my communication link (as I had a few of these left over from a job I have been doing for a client), but I have instead decided to switch over to some EnOcean 902 MHz parts.  I have used the EnOcean parts on a commercial lighting product in the past, so I decided to attempt to leverage my design by using some existing products, instead of creating my own versions of something very similar.  I have ordered the Sensor Kit - 902 (https://www.newark.com/enocean/sensor-kit-902/radio-module-raspberry-pi-902mhz/dp/33X0509), to provide some potential sensors and to allow me to reacquaint myself to with the EnOcean message formats.  I already have the EnOcean USB 300 Gateway dongle, so I should be able to quickly start viewing message packets and further define some of the communications for my design.

 

Here is a sketch of the system layout and communications for this project:

 

 

Thanks for reading!

Gene

Anonymous

  • Nice work!

     

    Based on the work I've done with high-speed line scan cameras, I think that technically this is using a reflector, not a collimator. Collimated light is a specific thing (like lasers and the sun). This is just reflecting and somewhat focusing the light. I highly agree that moving to a parabolic shape would be a big gain (although may 'focus' the light on the countertops), eliminate (or enlarge) the aperture, and if you can make the base PCB reflective, that would be the big gains.

  • in reply to shabaz

    Thanks

     

    I tried to reach a bit on this one.  I have been a big fan of lighting systems and concepts (including a short stint working in the lighting industry), so this seemed like a natural step.

     

    Thanks again,

    Gene

  • in reply to genebren

    Hi Gene!

     

    Excellent progress, this is a sophisticated lighting system!

  • in reply to three-phase

    Donald,

     

    I think that a parabolic shape is the way to go, but I am not sure that I can cutout and apply the shiny mylar film over a curved shape (it was hard enough to figure out how to do that with the flat taper of the current lens).  My plan is to try moving towards something closer to 45 degrees, trying to increase the diameter of the outer opening of the reflector (as well as the lens/cover opening.  Right now I am working on printing a clear(ish) lens/cover to see if this will increase the light output.

     

    Thanks,

    Gene

  • Good to see the progress being made. When you say you are going to increase the slope of the collimator, does that you are going to try and make it more bowl shaped as per a light fitting reflector?

     

    Kind regards