Diy led

Steven M said:
If you have 30volt power like the HLG-185H (the 30V - 6.2A version) and the led forward voltage you want to run is 3.3 volts, take the 30v ÷ 3.3= 9.09. So 9 parallel strings.
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funkman262 said:
Shouldn't it be 9 in series? The number you can run in parallel has to do with the amperage of the power supply. For example, if it's 6.2A and each string uses 1A, you can run a max of 6 strings total on that power supply.
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If I am off/wrong I do not have a problem if someone points it out. Now I am not sure, the numbers I am getting on my leds are not right.
 
Since the original post on the MW HLG-185H (30V-6.2A version) was from me, here are the calculations I made:


LEDs per string:

30V ÷ 3.6V (driver output ÷ LED forward voltage) = 8.33 rounded down to 8

So 8 LEDs per string



Number of parallel strings:

6.2A ÷ 700mA (driver current ÷ LED required current ) = 8.86 rounded up to 9

So number of parallel string = 9
 
That's correct. The number of LEDs in series has to do with the forward voltage of the LEDs and the output voltage of the power supply. The number of strings in parallel has to do with the amperage that each string will draw and the total amperage of the power supply. For the power supply being used, Tom is correct on the number of LEDs per string but I wouldn't round up on the number of strings allowed at 700mA. I'm not sure if it would blow the power supply but I would only run 8 strings at that current.
 
No problem running 9 strings @ 6,2 Amp.
The only thing is; with 9 strings and the current set @ max, the LEDs will be driven at 688mA, that would be 775mA with 8 strings .
Since the leds should be driven at 700mA max, you need to adjust the current output to 5.6A when running 8 strings parallel,
or wait and see how long the LEDs will survive @ 775mA ;)
 
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Blackhawk007 said:
I can see how this would be misleading with how I wrote it. No I did not get only 1 resistor, would pretty funny if I did though. I have 7 drivers running for a total of 42 strings. I have been able to test 4 drivers = 24 stings = 24 resistors. I did this because these were the 4 circuits that were easy to access. The others would require a bit more work because of the placement of each string, haven't gotten that far yet. My results are from all 4 that were tested. Sorry to be misleading, but thanks for pointing it out.

To be honest for the cost of the LED's compared to the cost of the fuses and the amount of work....I'm ok with loosing a few if something goes wrong.
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What driver are you running?"
 
:dance: I am happy to say that the battery in my tester was low. The numbers where jumping up and down. I jumped to the conclusion that it was the FEDY driver. Now my test results are 0.77 on all 6 strings. Temp in garage is 87. I am running 6 strings with 5 on each string, FEDY Royal Blue LEDs. I will be changing to a 6 string with 6 in hopes of lowering the current.
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Hi there, am on the verge of ordering these 18-20000k LEDs to the UK for a DIY fixture over my tank.

Was going to buy the lenses from the same HK company and wondered if anyone has already done this and has any feedback/experience on their lenses. They stated the 60deg lenses are the most common.

Thanks in adavnce,
Dan
 
personally...i can't see any difference between these cheapo's and the ones 10x their cost. ....its $14USD for 100....I would just add them to your order for that price
 
Thanks for the input BMB.
My lens MOQ is 250 - interesting but I guess their MOQ policy changed! Comes out at about $34 so still no big deal.

I guess I'll have a lot of surplus lenses.
 
i ordered 10k instead of the 18k. Some people have issues with the 18k washing out the coraline. but it if you dont care for coraline then its probably not a issue.
 
skunkmere said:
i ordered 10k instead of the 18k. Some people have issues with the 18k washing out the coraline. but it if you dont care for coraline then its probably not a issue.
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i looked up the place you got your leds from can you please pm me the link for the 10k leds please?

I only find 3w white upto 7500k... and lumen much lower than fedy's?
Thanks a lot



edit sorry found the 20k but the lumen is 140-160k as opposed to 220lm is that the right one i'm on?
 
jangofat25 said:
Thanks for the input BMB.
My lens MOQ is 250 - interesting but I guess their MOQ policy changed! Comes out at about $34 so still no big deal.

I guess I'll have a lot of surplus lenses.
Click to expand...

I'll be happy to purchase some of your extras...or anyone else's for that matter. I'm in need of 50. PM me if you'd like to sell some.
 
i think fedy is exagerating the 220lm. but even if not they are kinda hard to order from vs satisled. Fedy will only send you a min of 100 of each led, and optic. and the shipping goes from $45 up. my order would have been $63 plus 4% paypal fee. after all the shipping and buying leds that i didnt want but had to for the min order qty, i killed the order. im waiting on the satisled now. ill post how it goes. satisled shipping for small orer was like 35 usd
 
Maybe not exagerating but definitely overdriven. Nonetheless, they look great if you use enough of them and then dim the hell out of them and mix with some RB.

For anyone driving them @ 700ma and using no fans I want to come over with my meter and test them personally with you. These things get hot enough to burn you painfully and probably blister if you left your hand on it for 10 seconds. I have 2 builds with these things and they sizzle if you drive them.

Now, I put 2 120mm fans on them and they are cool but I have them way dimmed. They are definitely Cold White but 20,000k not. Yet I cannot take my eyes off them!

Anyhow, I'm convinced all of these 'old school' LEDs coming out of china are the same. FEDY = Satis.

I'm still going with all Cree for my 120g.

And no, I'm not going to drive across state to measure LEDs :). I just don't believe you if you say you are driving them on channel with no fans and they are cool.
 
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