astonehead
Well-Known Member
as above, should I get yellowing with 600w in a 4x4 tent? Running super efficient and quite high aswell, can’t bring myself to lower the wattage lol
Should I get yellowing at 600w?
- Thread starter astonehead
- Start date
astonehead
Well-Known Member
Will get some when the lights come on thanks
astonehead
Well-Known Member
And the cobs are only 300w between the 9 so reflectors help the intensity, 200 through the mixed boards then 130w though the 3500k boards all drivers are 1400ma dimmed or full on with the mixed boards
coreywebster
Well-Known Member
Its a hell of a fixture!
astonehead
Well-Known Member
Thanks. Took a little while to get together just contemplating a far red initiator to cover the fixture for after lights out
astonehead
Well-Known Member
just thought I’d described this as yellowing but it’s more like where they fade light green like their getting too much light
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coreywebster
Well-Known Member
I was literally about to ask about where on the plant it was yellowing... But I figured since it could be a few things I would wait for the pics.
VegasWinner
Well-Known Member
Agreed with others are you top feeding or bottom feeding?
Far red initiator. Check out ebay for a 4x4 6 10w far red cobs would work great at $5/ea
Far red initiator. Check out ebay for a 4x4 6 10w far red cobs would work great at $5/ea
astonehead
Well-Known Member
Getting 30000 lux at the top, but you are right after looking properly only 3 are going pale, so must be hungry and they are 12-20 inch’s away
astonehead
Well-Known Member
Top feeding and just looked couldn’t see a far red cob would you have a link to them
GrowLightResearch
Well-Known Member
Reflectors do not work well with LEDs due to the directional nature of LEDs.
The photons that hit the wall have very low intensity. If you look at the LEDs spacial radiation pattern what hits the wall will be less than 40%.
Reflectivity does not work as well as most think it does. When they say the reflective of a material is 95% that is at one angle.
Reflectivity goes hand in hand with refraction. Photons do not just bounce of the wall like a billiard ball bounces of the rail. Phontos act very bizarre when they are interrupted by an object.
One month ago I tested the irradiance of a single CoB outside on a very dark night and compared it with the same setup and measurements in a Gorilla tent. The measured results from both were within 1%. The tent was actually lower than the open space setup. It was a little cooler outside. I measured PPFD at 5 heights between 12" and 32". Inverse Square Law matched the variations in height perfectly in both the tent and outside.
Gorrilla's mylar sheets had zero effect on irradiance or inverse square law.
HPS and light bulbs radiate photons isotropicaly, that is equally in all directions. Completely different scenario.
astonehead
Well-Known Member
Done, I keep seeing him spouting rubbish
GrowLightResearch
Well-Known Member
I do NOT spout rubbish. Would you know the difference? Obviously NOT!
I share carefully researched and tested concepts.
Telling someone to take down the reflectors rather than dim is WRONG!! Very wrong. Go ahead believe the charlatans selling reflective film. I sell nothing and have no agenda.
Do you know for a fact the reflection does any good in a tent with LEDs? Have you run experiments and tested your "facts"? I have. There is a lot of misinformation floating around this site.
Here is a Noble Prize winning physicist saying the same thing I said in many more words. No one understands reflection. If you know how an optical reflecting grating (used in spectrometers) works, then you'd understand.
You have a problem with physics? Apparently you do not understand.
If you'd pay attention you'd learn something relevant to improving your grow.
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wietefras
Well-Known Member
Yes and yes. In fact several people have. People who actually know what they are doing as opposed to you. You are a noob who has never constructed or used a grow light. Which brings me to the last answer. NO you haven't, since you don't even have a grow light.
The people who did test this properly found a pretty much "inverse linear" relation between "distance from fixture to plants" and light intensity. They used a fill fixture and generally had the light at least at the correct height for good uniformity.
Measurements in a dark room will indeed show an inverse square relation. That is because the light can keep spreading over a surface area growing at a quadratic rate. With a reflective wall the light cannot spread any further than those walls and the inverse square stops once the light starts bouncing back off the wall. So measurements extremely close to the light can also show a hint of "inverse square" because then the reflection isn't countering the effect yet.
The fact that you still don't get this is truly staggering.
Just finally build yourself a full fixture and measure the light at 5", 10" and 20" in a properly reflective tent. Does the light intensity drop to 1/16th going from 5" to 20"? ie have you lost 94% of the light over those 15 inches? No of course not. In my grow area the light diminishes by about 4% for every 2 inches. That's about 30% for 15 inches.
you know, removing yourself from the genepool would help, A LOT. DO IT.