I have a blue/red type led light with uv and a bar light with white and red leds without uv. It seems like my plants stretch under the bar light. I’ve been carefully monitoring and moving my plants, but they stretch overnight. Does the light with uv keep them from stretching so fast or is that in my head? I’m at 1100 ppfd on most plants and they were at 900 ppfd yet stretched a bit to get to the 1100. It’s super hard to monitor the stretch since it happens really fast. It seems like they grow slower under the blue red leds and therefore have less stretch. Please let know your thoughts.
Led light blue red vs white bar lights
- Thread starter Jsnbaxter
- Start date
Nope_49595933949
Well-Known Member
With the PPFD I can't imagine it's stretching due to lack of light. What strain is it?
All strains are stretching. Jack herer white widow ice cream cake etc
Herb & Suds
Well-Known Member
Low output lighting leads to more stretch
Nope_49595933949
Well-Known Member
But how can he have low output with those ppfd numbers.
Herb & Suds
Well-Known Member
I think he may not be using an accurate measuring device and more of a phone app
Nope_49595933949
Well-Known Member
That's fair.
OP how are you getting those numbers?
Phone
18/6 Gro planner 640 watt 75%
15-17” to top of plants
Nope_49595933949
Well-Known Member
Do you have the settings correct for you light? I believe some phones need a sheet of 28# (I could be wrong) layed over the top of the sensor to be accurate.
Yes the paper is correct one. The plants are praying now, but they were stretching at 900 to ppfd to get to the 1100
Nope_49595933949
Well-Known Member
Pics? Are you sure they just aren't growing?
rkymtnman
Well-Known Member
you could try 24/0 for less stretch. or with the 18/6 try to keep on/off temps close
is the temp change causing the stretch at night?
rkymtnman
Well-Known Member
you got all kinds of issues going on: tip burn, deficiencies, leaf margins curling up.
rkymtnman
Well-Known Member
could be. what's your temp difference?
Nope_49595933949
Well-Known Member
If they are in veg still that's a lot of light. Your dli, if the PPFD is accurate it probably too high.