so If I get it right, it will not work out with inventronics(you can only have one option, either programmed setting or knob), but that it will work with meanwell, I already have a feeling which MW type driver would be able to do it, but rather that I would like to ask, to be more sure. I would appreciate you sharing
I agree I love to learn by talking with other people, just wanted to know his experience
It was not in soil, rockwool, everything was well, but suddenly all went very quickly to death. It was some kind of lichen/fungus. I think it is related to this thread since I think it was caused by the light. Checked out the grow bible but there was no mention of covering the top rockwool. That helped second time, maybe boiling off the water would help, it happened to me both rockwool and coco.
Im wondering if anyone experienced this issue and thinks it was caused by the lighti
so If I get it right, it will not work out with inventronics(you can only have one option, either programmed setting or knob), but that it will work with meanwell, I already have a feeling which MW type driver would be able to do it, but rather that I would like to ask, to be more sure. I would appreciate you sharing
I agree I love to learn by talking with other people, just wanted to know his experience
It was not in soil, rockwool, everything was well, but suddenly all went very quickly to death. It was some kind of lichen/fungus. I think it is related to this thread since I think it was caused by the light. Checked out the grow bible but there was no mention of covering the top rockwool. That helped second time, maybe boiling off the water would help, it happened to me both rockwool and coco.
Im wondering if anyone experienced this issue and thinks it was caused by the lighting
I’d recommend seedlings starter mix for seeds instead of rockwool.
You can soak seed for 5-8 hours or until they sink,put them 1/4 deep under surface in 16 ounce cups and they will come up.
Keep them in a warm place with RH 65-75% and nature will do the rest.
I’m assuming you’re new at germination and starting in rockwool can be done but seeding mix is super easy and roots like it.
Basically put seeds 1/4 deep water,put in warm high RH place under light and your done.
I don’t think germination is really needed if you
so If I get it right, it will not work out with inventronics(you can only have one option, either programmed setting or knob), but that it will work with meanwell, I already have a feeling which MW type driver would be able to do it, but rather that I would like to ask, to be more sure. I would appreciate you sharing
I agree I love to learn by talking with other people, just wanted to know his experience
It was not in soil, rockwool, everything was well, but suddenly all went very quickly to death. It was some kind of lichen/fungus. I think it is related to this thread since I think it was caused by the light. Checked out the grow bible but there was no mention of covering the top rockwool. That helped second time, maybe boiling off the water would help, it happened to me both rockwool and coco.
Im wondering if anyone experienced this issue and thinks it was caused by the lighting
I’d suggest getting some seedling mix at any garden center and use it for seeds.
It’s so simple using seedling mix but rockwool can have more things go wrong than a 16 ounce cup full of seedling mix,
Just germinate seeds,bury them 1/4” deep,put under light with warm temperatures and high RH and the seeds do the rest.
In 1-4 days seedlings are up and healthy.
You won’t need to water for 8-14 days if RH is 65%.
Over watering is most common mui
Yepp, you can do it this way to split the current in half and run the COB's more efficiently. But the voltage would slightly go down to around 106v or so. If you look at the Cree CXB datasheet you need to scroll down to the volt vs. current chart.
A CXB COB using 36v at 1,4amps would only use around 35v at 700mA.
So total wattage would go down a bit because the two parallel strings need only ~105 or 106v instead of 108.
This behavior is the same for all LED's no matter if it's a COB, a strip or a single diode. When current goes down voltage also goes down! Even if you use the dimmer you reduce the current flow and therefor also the voltage. The same goes for the other direction. If you turn up the current the voltage applied also increase and to make it even more worse it's visa versa too! If you reduce the voltage the current goes down because both of them limits each other.
So lets imagine it would be possible to reduce the voltage down to 103v with this driver. Because both limits each other the current flow would go down to maybe 150mA. And if you dimm the light down to 150mA it would be the same.
And to make it even more complcated there is another limiting factor affecting the voltage; the case temperature (Tcase or Tc.) or better said the junction point temperature(Tjunction or Tj.). Higher case temps reduce forward voltage too and therefor the driver can go higher in current until the same voltage is reach than before!
The difference between 25° and 85°C means a difference in forward voltage between 12 and 14%. Flux/w or "efficiency" is reduced by the same percentage.
For this reason we always try to keep the case temps as low as possible. Keep your COB's around 55°C and you lose only 6-7% efficiency. Run them at half current and you profit twice and you'll get even better efficiency. The difference between 1,4 and 0,7A are for sure 10-15°C less Tc./Tj. which means already 2-3% better efficiency and another 6-7% better efficiency you get from running them COB's at half current.(lower voltage = better eff.)
A CXB3590 in CD bin should reach ~2,2μMol/J system efficiency at 1,4A. 10% plus means around 2,42μMol/J at 700mA.
So with 3 COB's in series you would see 108v x 1,4A that would be 151,2w x 2,2 that's 332,6μMol/s PPF.
Running them 3s2p would mean only ~106v and x 1,4A it would be 148,4w but x 2,42 that's 359,1μMol/s PPF.
So your fixture would need ~3w less and you'll get ~27μMol/s more PPF out of your fixture!
Thanks,
