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  • Inexpensive Garage Lights From LED Strips

    I do this professionally (R&D industrial / commercial LED fixtures). Seoul Semiconductor does something similar with their Acriche series of "AC LEDs". The reason this is tough to do in an uncontrolled environment like these LED strips is that LEDs are incredibly current-sensitive, and their forward voltage varies with the current to some extent. Super-hard to balance multiple strings to run on AC - and remember that the "peak" voltage of an AC sine wave is separated by a lot of time below that peak - and the LED string won't conduct - so a lot of "off" time in the cycle - much more than the "on" time.What one actually does is to have several groups of LEDs that turn on at different points in the cycle as the voltage ramps up and down - but ...

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    I do this professionally (R&D industrial / commercial LED fixtures). Seoul Semiconductor does something similar with their Acriche series of "AC LEDs". The reason this is tough to do in an uncontrolled environment like these LED strips is that LEDs are incredibly current-sensitive, and their forward voltage varies with the current to some extent. Super-hard to balance multiple strings to run on AC - and remember that the "peak" voltage of an AC sine wave is separated by a lot of time below that peak - and the LED string won't conduct - so a lot of "off" time in the cycle - much more than the "on" time.What one actually does is to have several groups of LEDs that turn on at different points in the cycle as the voltage ramps up and down - but that's still noticeable. I have some early prototypes in my kitchen, and if you pour sugar or get the faucte dripping just right, they motion will "strobe" and freeze - and that's at 120 Hz.It's important to keep flicker up to a minimum of about 3KHz for physiological reasons.I'll attach a pic of my similar garage lights, with an Arduino sequencer. One LED is visibly out - can anyone find it?Here's a link to the motion video -

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  • mccanlessdesign commented on QAmakes's instructable Modern 5-elements LED Lamp (bars)2 months ago
    Modern 5-elements LED Lamp (bars)

    Cool! I made mine sequence from one LED driver, or I can turn them all on with eleven drivers (one for each rafter) for bodywork and detailing.

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  • Valentine's Day Papercraft - Robot Cupid

    For my daughter for tomorrow morning - thanks!

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  • mccanlessdesign commented on mtschaef's instructable Prosthetic Leg Lamp5 months ago
    Prosthetic Leg Lamp

    Hey - that looks like a major award!

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  • mccanlessdesign commented on JasonF205's instructable Faux Brick Walls10 months ago
    Faux Brick Walls

    This is just freakin' super. I'm going to use the idea in a wine cellar I'm building under our kitchen.

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