Meanwell HLG and LEDS - The Planted Tank Forum
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post #1 of 10 (permalink) Old 04-18-2017, 07:12 AM Thread Starter
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Meanwell HLG and LEDS

If I was using something like this?
HLG-240H-C700B - MEAN WELL - TRC Electronics

and i was going to use this https://www.amazon.com/dp/B01DBZI8RC..._t3_B01DBZK3V6

and this
https://www.amazon.com/dp/B00D1GT772...ing=UTF8&psc=1

how many led can i fit on it?
I'm guessing max 357.00 vdc / by max 34v = 10.5

So? 10 leds in total i think?


Can anyone how has build DIY leds Help pls?
Its for a 75 Planted/ iwagumi style tank
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post #2 of 10 (permalink) Old 04-18-2017, 01:46 PM
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4-10 but it will depend..
V(f)'s # 700mA is unknown and these chips are notoriously out of spec...
Need to be real life tested...
you could do 10 and it doesn't light, you could do 12 and it lights just fine..

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post #3 of 10 (permalink) Old 04-18-2017, 02:47 PM
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357 Volts DC and a glass box full of water???? There's plenty of other safer alternatives.
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post #4 of 10 (permalink) Old 04-18-2017, 03:34 PM
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Using 10 Meanwell Ldd's @ about $70 lets one individually control each chip..which is pretty fun.
Power supply can then go down to 48V (don't recommend 36) and 8A or thereabouts..
$26 + $80= $106

vs $64..
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post #5 of 10 (permalink) Old 04-19-2017, 05:40 AM
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in my opinion if your going thru the hassel of DIYing something like this mine as well go with something higher quality since most of your money will be tied up in driving the leds and the powersupply anyway.

Bridgelux Vero 18's are a great way to go 3 should easily light a 75 some nice build logs on here to get you started on ideas.
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post #6 of 10 (permalink) Old 04-19-2017, 06:36 AM Thread Starter
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i understand about half of the replies

i'm just using what i found from this beginners guide.
https://www.youtube.com/watch?v=UlM5uvO7sao

i guess i just want to do something like this video but with 10-50w led cobs of different colors
https://www.youtube.com/watch?v=IE5klMGUyoQ

Last edited by kancolle; 04-19-2017 at 07:12 AM. Reason: add vid
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post #7 of 10 (permalink) Old 04-20-2017, 05:24 PM
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What you started with isn't "wrong" but it is a "not recommended"... esp. for ones first build..
I've been "involved" in 2 of these high voltage builds and both were failures.. One using the 3W diodes anther using large COBS.


Technically is is rather simple.. just not so much in practice.. and 300V over water (as mentioned) is not exactly safe lighting..
the "safe" way w/ more control is only $40 more.. though pricing can vary.. sometimes you can get LDD's from the ek bay for $5 each..inc. shipping
$50 plus $26 $76 vs $64 and multiple parts (no "all your eggs in one driver" basket)

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post #8 of 10 (permalink) Old 04-21-2017, 07:05 AM Thread Starter
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so how would it work?

what is a good DIY build path?
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post #9 of 10 (permalink) Old 04-22-2017, 04:02 AM
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first start w/ the simple part.. Just ignore the PWM dim part. Pretend the "string" is one large chip..
Power supply needs to have a voltage rating of 3V + Chip requirement (say 36V for now) = 48V
simply speaking its current capacity should be driver amps x number of drivers.. So say 10 700mA drivers = 7A
48V 7A power supply.
Each ind. driver/LED combo is parallel wired to the power supply..so each set of wires goes to it..

Now you can do all hard wired w/ Meanwell LDD-HW or buy a circuit board and snap the correct ones in.
One caution: Most boards have a "pull down" resistor which means w/out that PWM signal the driver shuts off.

so unless you are planning on a "controller" stick w. the hard wired.
Some boards (one) has a jumper on it so you can "defeat" this safety proceedure.
A more complicated diagram.. again each "string" of LED's= 1 "chip"..


Heatsinking is next..

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post #10 of 10 (permalink) Old 04-22-2017, 09:56 AM Thread Starter
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i think i'd rather go one or more 700mA driver with 3w or COB leds in series.

using CREE CXB3590 or Bridgelux Vero 18

1 driver for each series, white than color LED
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