Lighty's attempt at LED lighting....

Discussion in 'Anything DIY Related' started by lIghty, 7 Jul 2013.

  1. lIghty

    lIghty

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    Hi All

    So after my lighting on my tank starting to fail today, I decided to try my hand with some LED lighting. :whistling:

    So I know I my choice of components probably won't receive a lot acceptance, but I thought what do I have to lose? and I'm not normal anyway :biggrin:.

    I know that DIY LED units have taken off quite a bit over the last 1 year or so, but being "offline" for some time I know I've missed out on a lot of information, so be gentle....:blush:

    My choice of LEDs:

    2x 100W "10 000k" (yes I know, that why I put " " ;))
    2x 50W Royal Blue

    All from..... yes guessed right...EBAY :tt2:

    Drivers:

    "Lighty's DIY drivers" - The main reason I decided to build my own was trying to find a driver that supported the required voltage and current and that was dimmable is near impossible! so because I can, i will :biggrin:

    So my design will support :
    • 12-80V sting voltage - more than one would ever need.
    • Each Driver will drive up to 4 separate strings, each with its own current limiting (300ma to 10A if you like!)
    • Analog/PWM dimming
    • Thermal protection (for driver and LEDS)
    • Automatic dimming on LED overheating.
    • Fault detection
    • Can be setup in a cascade configuration. (daisy chain)
    Controller:

    Will be something uC based, but lets get the lights working first.:biggrin:


    As some might know I'm a electronics hobbyist too, so if this works out its going to kill two birds with one stone.... if not, my wife will have the best garden light in the area :lol:


    So lets hear all the comments.
     
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  3. brettb2020

    brettb2020

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    Sounds really cool! I have a few questions and suggestions though.

    why did you go for the 100w multichip LEDs instead of the loose LEDs? The multichip LEDs quite inefficient compared to the loose LEds. Also, have you seen the 5 channel/colour 100w multi chip LEDs?

    Im not sure exactly what you have planned for the driver chips but have you seen these drivers from Mantech?

    Wish I had the time DIY my own LED unit, sounds like a blast! All the best with the build :thumbup:
     
  4. lIghty

    lIghty Thread Starter

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    Hi Brett

    The reasons I went with the 100w maulti chip was simply cost and easy of use in the sense of its package, not having to try mount like 100 individuals. They claiming 100lm/W, but who knows, but for R180 who's complaining and IMO worth a try.

    I have seen the multi channel LED 100w Chips, but they were quite costly, I also considered the Hybrid chip, but after some homework, it appears it was just a chip with a mixture of white and blue chips, going with this would not let to adjust the colours separately, so I thought it would be best to go with separate panels and drive them independently.

    I hadn't actually seen those, nice to know! but I'm looking for about 40V 3.5A.

    Thanks!
     
  5. dallasg

    dallasg Moderator MASA Contributor

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    nice idea!

    the secret to multi chip build as you know is cooling, i setup a 100w multichip with a thermaltake VGA cooling fan, worked great! did you get optics for the multi chips?
     
  6. danimal

    danimal

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    awesome stuff @lIghty. you're welcome to come check out my setup anytime can give you some pointers - the diy driver stuff can get tricky, i've made all the mistakes already :p
     
    Last edited by a moderator: 26 Nov 2015
  7. lIghty

    lIghty Thread Starter

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    Cooling is the main concern, hense the design has got the protection in it.

    I haven't ordered any optics, as I thought the chip would offer a decent spread, do you think I would need?


    Thanks Dan! That would be awesome, I'll give you a shout.
     
  8. dallasg

    dallasg Moderator MASA Contributor

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    no its not needed, they offer great spread, i did use a 120° lens just as cover protector.
    what size tank is it going over?
     
  9. lIghty

    lIghty Thread Starter

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    My 110g - 1400 x 600 x 600mm.

    How have you found the light from your 100w unit? and what unit is it? do you have a page covering your build?
     
  10. dallasg

    dallasg Moderator MASA Contributor

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    nope no thread...
    works great, i get about 700x700 coverage but on a shallow 300mm high tank.

    this was my test to see how the multi-chips work from a DIY perspective, i currently have 2 orphek Diff 100 which are using 100w chips.

    i am thinking of building a bigger unit to cover my new tank using
    50w @ 14k
    20w @ UV
    20w @ royal blue
     
  11. lIghty

    lIghty Thread Starter

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    Ok, sounds interesting. So 2x 100w White + 2x 50w Blues should work.
     
  12. dallasg

    dallasg Moderator MASA Contributor

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    yes they should be fine.
    for good info, search RC for dream chip build
     
  13. danimal

    danimal

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    what are you gonna use as the basis for your driver?
     
  14. lIghty

    lIghty Thread Starter

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    Thanks, will do!

    A dedicated chip by TI, the LM3464, just not looking forward to doing the DIY board and having to mount the 28HTSSOP :whistling:
     
  15. brettb2020

    brettb2020

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    Gee that is cheap hey! I bought 100w LEDs about 2 years back and they were about R550 on eBay.

    The trick to soldering those SMD buggers is a decent soldering iron, decent solder wick and lots of flux. Recently soldered a TQFP-64 chip. once the solder starts flowing dont stop till its done. :thumbup:
     
  16. zak

    zak

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    There's a much easier way of soldering SMD LEDs, I recently soldered about 50 to star boards, in under half an hour without damaging a single one..
     
  17. lIghty

    lIghty Thread Starter

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    Yip, I thought they where cheap too ;)

    The trick to those fine pitch packages is to tack the 2 corners down, then run it as you say with a nice cup soldering tip. I was thinking of just going with solder paste and reflow method, probably less chance of messing things up.:blush:
     
  18. danimal

    danimal

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    that's a good chip dude. there's a slightly simpler option i've used and developed qualified pcbs for if you want - the tps61500, also TI.

    soldering them is not too hard, can give you a hand if you need. ive got paste and a heat gun.
     
  19. lIghty

    lIghty Thread Starter

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    Thanks Danial, I'll check up on that chip and let you know! :thumbup:
     
  20. lIghty

    lIghty Thread Starter

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    @danimal

    Thanks, had a look at the spec sheet, but it doesn't cover my requirement, nice chip though.

    If cool with you, I would like to pop around sometime to come check your lighting setup!
     
    Last edited by a moderator: 26 Nov 2015
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