phxazcraig
- 543
- 93
In my first grow I cooked some autos pretty good before I got a PAR meter. I can set a maximum anywhere I want, but it's going to cost me in the corners. My plan is to be a little too hot in the center and a little too cool in the corners. Need to find the best balance, and that depends on knowing just how bright is too bright. Then I'll make it 'a little too bright'. 1000 PAR in the center seems safe, but the edges...I try to average out my ppfd over the canopy. Some tops might get a little more than i would like but i try to keep everything in the 700 - 900 range in flower without CO2.
I accidentally hit the canopy on one of my grows in flower with around 1250 ppfd and the plants looked fine, until they didn't.. Took quite a while to notice since the plants were a pretty decent size.
I’m running the hlg scorpion. Got 850ish at tops and 625 at edges. Tops are 18 - 24” from light. UVA on them too.I've got a grow where I don't have enough distance from light to canopy to evenly light the canopy. (12 inches in a 4x4 under a 600w HLG LED).
What's a reasonable upper limit to use to not damage the flowers directly under the light? I have over 1300 PAR right now, and over 500 in the corners. I like the corners, but am I going to scorch the center? So far the plants seem fine, but they have just (I hope) finished flower stretch so haven't been in this light intensity for more than a few days.
I'm growing Sour Diesel from seed in coco coir with 5x daily feedings. They are finishing week 4 since flipping to 12/12. Temp is well-controlled at 77-79F, humidity between 53 and 59% RH. Lots of air flow through the tent with power input duct at bottom and 6-inch inline exhaust fan at top.
I sure don't know for too powerful lights . I am just a poor Mars owner .I didnt see any curling edges or tacoing. What i saw were unexplained deficiencies/burns seemingly overnight.
Leaves pointing up (praying) is good. Curling edges, tacoing, unexplained deficiencies (cal/mag usually) and bleaching is bad.
A week ago I had 27 inches to play with, and about the same PAR readings.I’m running the hlg scorpion. Got 850ish at tops and 625 at edges. Tops are 18 - 24” from light. UVA on them too.
Isn’t that light dimmable?A week ago I had 27 inches to play with, and about the same PAR readings.
Today I have 12 inches of clearance left, and not so many options. 1300 in the center, enough at the corners, but coverage is dropping by the day as the plants grow taller and fill out.
Of course it is. What happens to the edge coverage then?Isn’t that light dimmable?
Well it will go down in PAR obviously. Have you checked to see by how much? You leave it where it’s at and you’ll end with crispy buds.Of course it is. What happens to the edge coverage then?
My room ceiling is high enough to get through stretch without light distance ever becoming an issue. Room is only like 4 ft wide and with that scorpion in the ceiling I haven’t ever had to lower it. Just use the intensity dial. I have never had it up all the way at full power.I am a big fan of HLG and the Diablo but there is merit in bar light over boards .
This would be one of those times IMO .
I'm at around 12 inches now, which is just barely enough coverage. Consider what happens if the light is so close to the canopy that 6 inches on each side is basically unlit. That turns a 4x4 tent into a 3x3.Well it will go down in PAR obviously. Have you checked to see by how much? You leave it where it’s at and you’ll end with crispy buds.
750 is good average for hybridsI've got a grow where I don't have enough distance from light to canopy to evenly light the canopy. (12 inches in a 4x4 under a 600w HLG LED).
What's a reasonable upper limit to use to not damage the flowers directly under the light? I have over 1300 PAR right now, and over 500 in the corners. I like the corners, but am I going to scorch the center? So far the plants seem fine, but they have just (I hope) finished flower stretch so haven't been in this light intensity for more than a few days.
I'm growing Sour Diesel from seed in coco coir with 5x daily feedings. They are finishing week 4 since flipping to 12/12. Temp is well-controlled at 77-79F, humidity between 53 and 59% RH. Lots of air flow through the tent with power input duct at bottom and 6-inch inline exhaust fan at top.
Without CO2 enhancement, you'll start to see light burn around 1200-1300 PPF. You want yourPPFD to be in the 700-900 range. Above 1000 PPFD your plant start using light avoidance mechanisms without additional CO2. If you have a meter or an app to measure PPF, use that to adjust your light via dimming.I've got a grow where I don't have enough distance from light to canopy to evenly light the canopy. (12 inches in a 4x4 under a 600w HLG LED).
What's a reasonable upper limit to use to not damage the flowers directly under the light? I have over 1300 PAR right now, and over 500 in the corners. I like the corners, but am I going to scorch the center? So far the plants seem fine, but they have just (I hope) finished flower stretch so haven't been in this light intensity for more than a few days.
I'm growing Sour Diesel from seed in coco coir with 5x daily feedings. They are finishing week 4 since flipping to 12/12. Temp is well-controlled at 77-79F, humidity between 53 and 59% RH. Lots of air flow through the tent with power input duct at bottom and 6-inch inline exhaust fan at top.
How old are your LED lights? I have four Mars SP-3000 LEDs and keep it at 14 inches too :-). My PAR is about 1200 on top. LED lights are suppose to weaken over time. I only had mine for 6 months now and the SP-3000s are operating very well.I sure don't know for too powerful lights . I am just a poor Mars owner .
I would think VPD may have had an effect along PAR but I can't say for sure . Thinking leaf temp in particular ?
My TSL 2000 are at 100% about 14-16 inches from canopy at 750 PAR .
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