Recent content by Danielson999

The light looks great. In a tent I'd take those reflectors off and lower your light a tad, especially if you are height limited but mostly just because you get such great light spread with them off. The more spread out your light is the less shadows there are and the more light that gets down...

Sorry been busy. This is totally normal. If you have a B version Meanwell driver and you don't use the dimming, you will actually get over 100% of the rated power. I believe it's somewhere in the 5% area of bonus power. If you're running 2 hlg-185's which give you 200w of power each then 390...

You can use a kill-a-watt meter or something similar and know exactly what each driver is pulling but instead of buying 5 different kill-a-watt meters you can just use one on each driver and pot at a time and use a black marker pen to put a small mark around the pot knob at intervals of 25% -...

You don't really want to dim all of them at the same time because it sets you up for problems. I would get five 33k ohm pots and run 3 drivers off each. That way if something goes wrong with a cob it doesn't affect your entire grow. You would add a 3k or 3.5k resistor to each pot to limit your...

You take the 2 positive dimming wires and run them into a 3 prong wago, then run one wire from that wago to your positive terminal on the pot. Then you take the two negative dimming wires and run them into a 3 prong wago and run one wire out to the neg terminal on the pot.

Yes, after reading it a second time you still state 2.4a for your cob. There is no such thing as a 2.4a cob, it's merely a measurement of the amperage it's being run at. I think the real problem is you don't know what you're saying :thumb: Anyway, if you go back and read carefully, you'll...

I've seen them a hundred times. Have fun running your cobs passively at 2.4a on a heatsink that doesn't work well at dissipating heat. I'm just trying to save you some time but hey, don't put a fan on them. And use a 10k ohm potentiometer too, I'm sure your setup will be running real sweet. Good...

Like I was saying, the fins on that material are not good for dissipating heat. They need to be spread out much further apart to let air vent out properly. A fan will be a very smart addition to that type of extruded heatsink. And whatever you do, don't use a 10k pot on your lights as suggested...

If you're running them at 50w each then yes, you will need a fan with 8000cm2 of material. Obviously if you under-drive them the entire time you could get away with no fan but if you ever want to run them at max you will run a risk of burning your cob up. So how are you wiring them? I asked once...

Oh I see, I thought you were saying your total surface area was 3000cm2. So yes, 2 cobs on one bar will need a fan. 3 cobs on one bar will need at least 2 fans just to be safe anyway.

And about your potentiometer. Simply divide 100k ohm by the number of drivers you are using to determine what pot you should use. 1 driver = 100k ohm, 2 drivers = 50k ohm, 3 drivers = 33k ohm etc. If you use 2 drivers you use a 50k ohm pot. By adding a resistor valued at 10% of your 50k, means...

The more power you give a cob the hotter it gets and the less efficient it becomes. If you ran 1 cob on 2 separate bars, one using a fan and one not using a fan, the cob using the fan would be providing more light to the plant because less power is getting turned into heat and more is being...

Typically you will need 100cm²/w for passive cooling and 30cm²/w for active cooling. 150w on one bar = 75 heat watts. 75x30=2250cm² needed to actively cool. 100w on one bar = 50 heat watts. 50x100=5000cm² needed to passively cool. 3000cm² of material is good for about 100w of heat dissipation...

I have some similar heatsink material. I can tell you from experience that the fins are spaced quite closely together which are not optimal for dissipation. I can't tell how thick the base of those are but if it's thick enough you might get away with running 2 cobs passively. I would still put...

Dimmed down you'll be getting some crazy efficiency and hardly any heat. Will be interesting to see how hard you can push them before they kill your plants. I'm guessing at 50% or so would be getting close. You doing a grow journal?