Which would produce more DO in a DWC?

JSB99

JSB99

Well-Known Member
2com said:
Sweet light build @JSB99, are the qbs on the ends of the fixtures only connected/screwed in at one corner/point?
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Yeah, they're just held in on the corners, and supported by the small bar. I put zipties on the bar to prevent them from swiveling. I have the two rigs connections Ted with a couple twisty ties to prevent the fan wind from banging them together. But I think a bigger advantage is they allow the rigs to be better positioned.
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JSB99

JSB99

Well-Known Member
Before switching from hps to led, I would see posts of led lights burning tops from lights being too close. So I've been kinda cautious, and watched the girls closely, as I got the lights closer and closer.

Now, I have my lights around 90%, and as close as 12" to 14" to some of the tops. I'm reading 50k to 60k > at the tops, and as much as 30k @ 24". I haven't seen any kind of burning or anything. My room is cool, though. I have to use a small heater at times. And, I've got two big oscillating fans. One of the reasons I really wanted to go tentless.

So I'm wondering, is it because I'm an experienced grower and know how to get my lights close without burning them. Or, do the type of led panels I've got going have anything to do with it.

Word to the noobs: You'll see duct tape taped to the grills of the fans. This is because these fans are too powerful with how close they are. The duct tape acts as a diffuser so the leaves don't get wind burn.

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2com

Well-Known Member
JSB99 said:
Before switching from hps to led, I would see posts of led lights burning tops from lights being too close. So I've been kinda cautious, and watched the girls closely, as I got the lights closer and closer.

Now, I have my lights around 90%, and as close as 12" to 14" to some of the tops. I'm reading 50k to 60k > at the tops, and as much as 30k @ 24". I haven't seen any kind of burning or anything. My room is cool, though. I have to use a small heater at times. And, I've got two big oscillating fans. One of the reasons I really wanted to go tentless.

So I'm wondering, is it because I'm an experienced grower and know how to get my lights close without burning them. Or, do the type of led panels I've got going have anything to do with it.

Word to the noobs: You'll see duct tape taped to the grills of the fans. This is because these fans are too powerful with how close they are. The duct tape acts as a diffuser so the leaves don't get wind burn.

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How warm are the actual plants?
Do you have iphone or android?
 
2

2com

Well-Known Member
JSB99 said:
I'm a tech kinda dude, so I love hacking and messing with my android devices :)

My canopy tops are 76°
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Ah, I see. I don't have iphone either. I was gonna suggest a par/ppfd app *that apparently actually works*, but it's not out for android (yet). I made a post about it, "Korona" app (growinganswers did a video, test, review on it). I have access to an old, iphone 6 but it needs a battery replacement, otherwise I'd use it.

Anyway...

76* is too cold, if you measured that with an ir thermometer..? What's the room ambient air temp again - probably 80-82*F ish? I understand you're having to add heat to the room though, so if it's a money thing, I get it - been there. (Your plants look good regardless, I don't see much purpling, or anything else. Really nice internodal length it looks like, too. Good job, dude.).

Seeing as you just came from HID, did you happen to check actual plant temps under that setup?
 
JSB99

JSB99

Well-Known Member
2com said:
Ah, I see. I don't have iphone either. I was gonna suggest a par/ppfd app *that apparently actually works*, but it's not out for android (yet). I made a post about it, "Korona" app (growinganswers did a video, test, review on it). I have access to an old, iphone 6 but it needs a battery replacement, otherwise I'd use it.

Anyway...

76* is too cold, if you measured that with an ir thermometer..? What's the room ambient air temp again - probably 80-82*F ish? I understand you're having to add heat to the room though, so if it's a money thing, I get it - been there. (Your plants look good regardless, I don't see much purpling, or anything else. Really nice internodal length it looks like, too. Good job, dude.).

Seeing as you just came from HID, did you happen to check actual plant temps under that setup?
Click to expand...
Yep, those temps came from an IR gun. I would be around that when I had my HID, because my hood was sealed. During veg I'd have them around 81°. Its not a money issue. I can run the heater. The room is warmer than my house, @ 70°, but it does feel a little like autumn in there. I'll warm up the room a bit. I was thinking today that it might be a little cool in there. Oh yeah, the ambient room temp is 75°, and the room doesn't get any cooler than 65° during lights out.

I have my drivers wall-mounted, so the light rigs produce very little heat, especially with the oscillating fans breezing them. I've also got a small fan on the drivers to keep 'em cool, but I turn the fan off if I want to creep the temps up a bit, from the heat.
 
2

2com

Well-Known Member
JSB99 said:
Yep, those temps came from an IR gun. I would be around that when I had my HID, because my hood was sealed. During veg I'd have them around 81°. Its not a money issue. I can run the heater. The room is warmer than my house, @ 70°, but it does feel a little like autumn in there. I'll warm up the room a bit. I was thinking today that it might be a little cool in there. Oh yeah, the ambient room temp is 75°, and the room doesn't get any cooler than 65° during lights out.

I have my drivers wall-mounted, so the light rigs produce very little heat, especially with the oscillating fans breezing them. I've also got a small fan on the drivers to keep 'em cool, but I turn the fan off if I want to creep the temps up a bit, from the heat.
Click to expand...
I've never seen plant temp above or at ambient air temp with leds. In fact leaves felt cool to the touch, and always several degrees cooler than ambient (6-8*F ish), then if they're transpiring they feel even cooler.
Getting them warmer, and up to that 82*F point is night and day difference. To the point I'd be hard pressed to suggest led for a cold climate/room grower unless they're gonna seal the room and not air exchange (or unless they're otherwise going to get the temps up to required levels).
Finding a way to add heat that also adds something else beneficial is a good idea (co2 generator for eg.) I'm looking at cmh...which would have to replace some led.

Bringing in the cold air to chill that res might not be helping the room temp, is it a loop that then leaves the room, or does that cold air just leave the tote and diffuse into the room after?

Anyway, I'm rambling.

Edit: added.
 
JSB99

JSB99

Well-Known Member
2com said:
I've never seen plant temp above or at ambient air temp with leds. In fact leaves felt cool to the touch, and always several degrees cooler than ambient (6-8*F ish), then if they're transpiring they feel even cooler.
Getting them warmer, and up to that 82*F point is night and day difference. To the point I'd be hard pressed to suggest led for a cold climate/room grower unless they're gonna seal the room and not air exchange (or unless they're otherwise going to get the temps up to required levels).
Finding a way to add heat that also adds something else beneficial is a good idea (co2 generator for eg.) I'm looking at cmh...which would have to replace some led.

Bringing in the cold air to chill that res might not be helping the room temp, is it a loop that then leaves the room, or does that cold air just leave the tote and diffuse into the room after?

Anyway, I'm rambling.

Edit: added.
Click to expand...
A'ight, got my little heater going.
 
JSB99

JSB99

Well-Known Member
2com said:
I've never seen plant temp above or at ambient air temp with leds. In fact leaves felt cool to the touch, and always several degrees cooler than ambient (6-8*F ish), then if they're transpiring they feel even cooler.
Getting them warmer, and up to that 82*F point is night and day difference. To the point I'd be hard pressed to suggest led for a cold climate/room grower unless they're gonna seal the room and not air exchange (or unless they're otherwise going to get the temps up to required levels).
Finding a way to add heat that also adds something else beneficial is a good idea (co2 generator for eg.) I'm looking at cmh...which would have to replace some led.

Bringing in the cold air to chill that res might not be helping the room temp, is it a loop that then leaves the room, or does that cold air just leave the tote and diffuse into the room after?

Anyway, I'm rambling.

Edit: added.
Click to expand...
Today the room and canopy were at 81° without having to adjust anything. Its a tiny heater, which is perfect.
 
OldMedUser

OldMedUser

Well-Known Member
Space age looking setup man!

I'd love to switch over to LED but have so much invested in HIDs and a severe cash shortage so keep paying those outrageous hydro bills for now. $530 bill for last month for 2010kwh works out to 26.4¢/kwh! The wife has all my old T-12s going to raise her veggie plants and I'm only using 600w for my plants so it's higher than usual but hurtin' bad. Warmer weather now so the bill should drop as she doesn't need the water heaters for her chickens but I'll be using more lights soon to start flowering some plants inside.

If I can raise a few hun I'll try building some LEDs but so many things need some cash around here. Owning your own home has it's pluses and minuses. :)

:peace:
 
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