Connect with us

LED lighting thermal fuse

Discussion in 'LEDs and Optoelectronics' started by Buddha_Nature, Jan 8, 2015.

Scroll to continue with content
  1. Buddha_Nature

    Buddha_Nature

    2
    0
    Jan 8, 2015
    I'm building a grow light that has 30 3w LEDs using a driver with the following specs and would like to add a thermal switch or fuse to protect it from overheating. Any ideas of what I should use? I plan to mount them (LEDs) to a heatsink with fans.
    100W; Input voltage: AC 100~240V 50/60Hz; Output voltage: DC 8~12V; Output current: 8A
     
  2. chopnhack

    chopnhack

    1,573
    354
    Apr 28, 2014
    Watcha growin?
     
  3. Gryd3

    Gryd3

    4,098
    875
    Jun 25, 2014
    Parsley, maybe some thyme and wheatgrass? No matter, leave the details out and it makes no difference.
    As an aside... Chlorophyll likes to absorb some specific wavelengths more than others.
    Simply using white will work to a limited degree, but if you can get your hands on some LEDs in the red, and ultraviolet range, you'll have better luck. There are also 'grow' light specific LEDs that operate in those wavelengths.

    Anyway.. there are a couple options for you... you can simply cram a thermal fuse onto the heatsink, or you can put a temperature probe on it and use a comparator to be able to adjust the sensitivity on the fly. (Simply use it to trip a relay and cut power... when the device cools down again you can auto-power it back up. Just make sure to use hysteresis if this is the plan you want to use.)
     
  4. Buddha_Nature

    Buddha_Nature

    2
    0
    Jan 8, 2015
    Not knowing how hot this is going to run, the comparator/probe idea is probably the best option. I didn't want to add a 12vdc circuit as I was trying to keep this project as simple as possible, but safety first!
    I'm growing tomatos ;)
    I'm running red 660nm + 625nm and blue 460nm + 445nm which should cover the the desired spectrum.
     
  5. FORMER AVIONICS TYPE USN

    FORMER AVIONICS TYPE USN

    2
    0
    Jul 27, 2015
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-