Minimum Amp per Diode with LM561C

Takeshy

Takeshy

Well-Known Member
Hello!

What should be the minimum amp per diode in order to get a good canopy penetration using LM561C?

Thanks in advance!
 
tomate

tomate

Well-Known Member
You can go as low as you are willing to pay for.
What do you exactly mean with penetration? Uniformity, depth?
 
Takeshy

Takeshy

Well-Known Member
tomate said:
You can go as low as you are willing to pay for.
What do you exactly mean with penetration? Uniformity, depth?
Click to expand...
Depth.

If I drive each diode below 100mA, won't it be too low to drive them? Leading to less light penetration but more uniformity due to the fact that I will have probably more diodes in the lightning system as I'm underdriving them.

I see many users of LM561C running them at +100mA that's why I'm asking.
 
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tomate

tomate

Well-Known Member
Takeshy said:
If I drive each diode below 100mA, won't it be too low to drive them? Leading to less light penetration but more uniformity due to the fact that I will have probably more diodes in the system as I'm underdriving them.
Click to expand...
If you drive them lower and have instead a greater amount of diodes to compensate it, you will still have a good depth penetration. It will get even better the more diodes you have and the more diffuse the light will get because of this fact.
It is a common misunderstanding when people think that the depth penetration is getting worse when you use mid-power LEDs compared to COBs or other more powerful lightsources.

Here is a comparsion of 16 CXB3590 against 18 FB22B (4' F-Series) both at the same luminous flux. That is 16 vs. 2592 light sources. 12" min. distance for the CXBs and 4" for the FB22B. You can see that both the uniformity and the depth penetration are a little bit better with the stripes.
ani.gif
 
Danielson999

Danielson999

Well-Known Member
tomate said:
If you drive them lower and have instead a greater amount of diodes to compensate it, you will still have a good depth penetration. It will get even better the more diodes you have and the more diffuse the light will get because of this fact.
It is a common misunderstanding when people think that the depth penetration is getting worse when you use mid-power LEDs compared to COBs or other more powerful lightsources.

Here is a comparsion of 16 CXB3590 against 18 FB22B (4' F-Series) both at the same luminous flux. That is 16 vs. 2592 light sources. 12" min. distance for the CXBs and 4" for the FB22B. You can see that both the uniformity and the depth penetration are a little bit better with the stripes.
View attachment 4035821
Click to expand...
16 vs 2592? I don't think so. The cobs aren't one big diode. Judging by the picture you provided they both look very much the same. Personally I would prefer that look of the cobs because I don't typically push my plants up against the tent walls much.
 
tomate

tomate

Well-Known Member
Danielson999 said:
I don't think so. The cobs aren't one big diode
Click to expand...
I know, but you can see them like a single point light sources. Maybe it would be better to compare the LES which is more than 2 times larger with the stripes in my example.

Danielson999 said:
Personally I would prefer that look of the cobs because I don't typically push my plants up against the tent walls much.
Click to expand...
Sure why not if it fits your needs better. But the typical monoculture SOG or ScrOG will definitely benefit from the better uniformity.
 
nc208

nc208

Well-Known Member
Takeshy said:
Hello!

What should be the minimum amp per diode in order to get a good canopy penetration using LM561C?

Thanks in advance!
Click to expand...
I run them at 116.67 ma per diode at full blast. But I don't run them that high probably 50-75% power usually. I also use some vero 10's 2k. My plant is 36" away. Here is a pic of my plant at 5 weeks from seed. Do you see any sign of stretching from not enough light.
1135.jpg
 
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