Reflector size calculations (WIP)

I might be needing to order a custom reflector in the future and have been experimenting with different reflector sizes and specs, and I thought some people might be able to use this stuff too:

Currently this is just some functions to determine depth, diameter, opening size, and that kind of stuff about the parabola, eventually I might make it into an open source program to calculate intensity and the much more difficult but important specifications.

For now, this will be a place to store progress and make updates, and anyone can use this with the free online Desmos graphing calculator :)

UPDATED: https://www.desmos.com/calculator/idvrtc2zsf

A lot of functions and calculations have been added, so it may seem overwhelming at first.

In the left sidebar you can click on the little folder icons to show/hide certain features to make the graph easier to understand.

I will work on adding more comments and documentation as I go along, feel free to post any questions if you have them!

:)

Old screenshot:

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The 2 things you can adjust are H and W, the height and width of the reflector.

Based on these two measurements the parabola is created such that the focal point is always at 0,0 and that is where the LED would go.

Also, depending on the width and height, the opening at the bottom (called 'd') will be a certain size.

Hopefully someone can use this when designing their reflector size, especially if planning to order a custom one from optiforms or phoenix.

I will keep updating this thread the more progress I make on the design.

I don’t run windows so I cannot try this one out :smiley:

Parabola Calculator version 2.0

Read about it and download from here Parabola Calculator version 2.0

It is not as precise as the one you used but maybe it could be used for a quick tryout of a design then use the detailed one for the exact measurements.

Cheers David

Yup, I saw that one on google but haven’t tried it.
It also seems like that one calculates height from the bottom of the reflector, however the one I coded is specifically for LEDs which cannot use anything of the reflector below it, so it cuts the bottom off :slight_smile:
That calculator software would work well for incandescent/HID lights though.