25 Strip Build Designs for Samsung H-Series, F-Series, Q-Series, and Bridgelux EB Gen.2

ledgardener

ledgardener

Well-Known Member
PilouPilou said:
Amazing work, congrats!

Just one question concerning security: we all know that a lot of Volts are dangerous in a serie system but what about a lot of Amps in a parallel system?
Click to expand...
Thanks.

Ultimately, it’s the current that does the damage, but it needs a high enough voltage to overcome the resistance of your skin and start flowing through your body. You could have a huge current source with hundreds of amps but if the voltage is too low, all that current won’t go anywhere.

A good example is a 12V car battery. They’re capable of discharging a ton of current but yet I can grab both terminals at the same time and not feel a thing because the voltage isn’t high enough.

There are also things that can lower your skin’s resistance (like getting it wet) that can lessen the amount of voltage required to get harmful or fatal current flowing.
 
1

1212ham

Well-Known Member
Great work!

Just a couple minor points, not meant to criticize your work in any way...
$6 for a resistor in series with dimming pot, should be pennies, must be a typo.
Bridgelux EB strips don't need a heat-sink at nominal current.
 
ledgardener

ledgardener

Well-Known Member
1212ham said:
Great work!

Just a couple minor points, not meant to criticize your work in any way...
$6 for a resistor in series with dimming pot, should be pennies, must be a typo.
Bridgelux EB strips don't need a heat-sink at nominal current.
Click to expand...
Thanks for the feedback! I just linked the first pack of resistors of the correct values I found on Amazon. They can certainly be had for cheaper locally or via digi-key or similar. If I get the time, I'll see what digi-key has to offer instead and change the link.

I added sinks for the EB strips since each build runs them at 75% of max rated current and it made more sense to me to stick with the heatsinkusa sinks throughout the entire article, rather than deviate in favor of aluminum channel for only the EB strips. When you say nominal, which value are you referring to for the EBs? The data sheet shows 700mA and 1,400mA max for the 1 and 2/4 foot strips, respectively.

Also just added 1-foot versions of the 2x2 and 2x4 space builds in case the 2-footers didn't fit in people's tents. Just have to do this with 2-footers for the 4x4 space builds now.
 
ledgardener

ledgardener

Well-Known Member
HalfBee said:
This makes it so much easier to convince the 2x2 and 3x3 beginner growers they
don't need to go for the 3590's and 50+ w/sf. Love my EBs just wish 4000K were
more available and not limited to whatever digiKey wants to carry...
Click to expand...
Nice. What temp are you running? Also, gen 1 or gen 2?
 
1

1212ham

Well-Known Member
I found resistors much cheaper on ebay and Amazon, but they do have a few weeks shipping time.
https://www.digikey.com/product-detail/en/yageo/CFR-50JB-52-10K/10KH-ND/337

My oversight about heat-sinks for the Brideglux EB's. I didn't notice the build was running 75% of max current. I was thinking nominal current, 350ma for the 1-foot and 700ma for the 2&4 foot.

It happens that I tested temperatures yesterday on a 2ft. EB, Gen-2. It was done in still air with no heat-sink.
At 700ma I measured around 112F/45C with an infrared thermometer. At 1050ma (75% of max) it was 145F/63C. Voltages were 19.47 and 20.0 respectively.
 
Last edited:
HalfBee

HalfBee

Well-Known Member
ledgardener said:
Nice. What temp are you running? Also, gen 1 or gen 2?
Click to expand...
Running Gen1 4000K 560mm at 700mA - two in veg area & four in flower box with four mixed Vero18s.
Ordered them just after they came out and had first original stock. Was running 3000K and 35000K
spectrum (some 90CRI in mix) and wanted 4000K to hold down stretching.

I like 4000K as it's more white looking, and the 5000K Vero13s have a definite blue shadow.
Am a bucking LDD junkie and running two strips @700mA on a LRS-48 volt supply with no problem.
It's at the upper range of voltage that way yet will run 6 strips with no issues.
Lite_config.jpg
 
Gilligans Island

Gilligans Island

Well-Known Member
I used this information for my set up. Excellent resource for beginners to get into led without breaking the bank. The drivers are 110/220 volt. How are the drivers wired for 220 volt? I have the 5x5 set up with bridgelux led's. Boy are those led's tiny!
 
You must log in or register to reply here.
Top