Lighting Jobs and Contests

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Project/Contest Description Bids/Entries Skills Started Ends Price (USD)
My Lighting Project Looking for decorators for house, buildings, halls 12 Lighting May 25, 2017 May 25, 20173d 8h $828
Lions Impact I am looking for content writer who can write content for my website 15 Ghostwriting, Articles, HTML, Content Writing, Lighting May 24, 2017 May 24, 20172d 5h $843
LED street lighting Hi, First of all please only people who has a lot of experience with LEDs. I am trying to put together a LED street light prototype and I need help with the circuit so the whole thing does last as long as possible, does not blow up in the long term because of some electrical moshumushu magical thing and is very power efficient (every % of the power consumption matters!). 1) I need to know how to wire up high power LEDs in multiple strings where each of them can be dimmed by PWM signal from the micro controller. What I understood so far is that this will require "constant voltage" power supply which can be a bit tricky with LEDs. For example I need to wire up 12 LEDs ([url removed, login to view]) into 2 to 4 strings, each dimmed with PWM and I am interested in how to do it in the most power efficient and safe way to do it so the LEDs don't suffer in the long term. 2) Secondly I would like to know how do I wire up for example 20 high power LEDs (the same ones) in the most power efficient and safe long term functioning way where all 20 LEDs can be controlled by a single PWM signal. 7 Electronics, Microcontroller, Electrical Engineering, Lighting Jan 12, 2017 Jan 12, 2017Ended $78
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