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Introduction:

Green Tech Contest

Finalist in the
Green Tech Contest

Step 1: The Supplies

Step 2: Assembly

Step 3: Wiring & Connections

Step 4:

Step 5:

Step 6:

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22 Comments

Thank you for this project. You addressed an important issue. I also like high temperature at noon and low temperature in the evening.

Maybe you should consider other strips. According to the datasheet (https://www.diodeled.com/custom/download/productFile/filename/DI-24V-KRNG-Specification%20Sheet.pdf/) they have a horribly low CRI of 68%. 80% is minimum these days.

Changing the color temperature by mixing two spectra is not ideal (http://www.astro.umd.edu/~cychen/MATLAB/ASTR120/Blackbody2,%205-2-10_03.png) but unfortunately we don't have other options.

The reason this is so expensive is...there is only one manufacture of this type of LED. The switch is a LED dimmer. the trick is that the LEDs respond to the dimmer by changing color temperature instead of output level.

You're totally wrong. Only output levels are changing, cold leds decrease while hot increase, and vice versa.

There are quite a few manufacturer's that make these LED's. The strips themselves have two circuits to them, one for the higher and one for the lower kelvin temperature LEDs, the two circuits are individually dimmable; thus the ability to create your own color temperatures. The led's themselves cannot change color temperature.

would this project work with an LED bulb or must it be an LED strip?

cheers mariana

"Yes." You could do it with a color temperature LED bulb, if you can find one they're not hard to find either, LimitlessLED, EasyBulb, and MiLight are all names for the same bulbs. The thing is that they are standard E26/E27 or bayonet bulbs running on mains power. If you want it 12v for safety or other reasons, you have to go with strips.

What you *can* do to save a little money ov the pricy three wire VCT strip is buy a WW strip and a CW strip. I routinely see these for $10-12, often with 12v wall wart and an IR remote controller you won't use. :P Splice the two + wires together if your controller doesn't have two terminals and just put them parallel to each other. so you need 20mm plus a little slop instead of 10mm and slop, big deal.

If you like the MiLight idea, they do make a MiLight LED strip controller—and you can get a flat wall-plate-looking remote for the MiLight VCT stuff (strip controller or mains LED bulbs) off eBay. Everything else you can find on Amazon. I'd share links to stuff I know works together to save you a little research , but I don't wanna step on any toes and risk being regarded a spammer.

BTW, the temptation to buy waterproof LED strips… I'd resist it. Harder to get the silicone off the cut points than it looks like on YouTube in my experience.

Nice work! This is a great project, but in the interest of transparency, you should disclose that you're an employee of Elemental LED in step 1.

Good luck in the contest!

It is true, I am an employee. I hope you don't fee you've been tricked or duped. I feel my creativity goes beyond my choice of work place.

No skin off my teeth -- I knew that going in. I also really like the project and Elemental LED, and there's nothing wrong with recommending your employer's products if you're passionate about using them. I'm just suggesting that you make that clear up front, so it doesn't come back to bite you in the butt later. :)

Thanks for your concern.