whats the max par you have gotten under an air cooled 600w hps?

**CityDweller** · 23-06-18, 11:56 AM

Originally Posted by hotshot

I've got a 900/385W LED on my plant at 13" from the top bud. There is no bleaching at this distance. According to the factory Par Meter, I am getting a little under 1900 PAR at the top bud, with no bleaching. So, my question is how much par would you have to shine on your bud to cause them to bleach out?

You cannot go off the specs. You would need a Par meter to confirm actual Par. I would think that if it was actually 1900 par it would lead to photoinhabition which causes bleaching.

pls excuse autocorrect. i am high of course.

**GEORGE** · 23-06-18, 02:13 PM

Originally Posted by CityDweller

You cannot go off the specs. You would need a Par meter to confirm actual Par. I would think that if it was actually 1900 par it would lead to photoinhabition which causes bleaching.

pls excuse autocorrect. i am high of course.

I disagree, I think it has all to do with Watts, and PAR is just a selling point for LED"s. JMO O, and there is a par meter in that chart.

**Cooky2992** · 25-06-18, 05:46 PM

PARdon 😅

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**ast.enthus** · 26-06-18, 01:40 PM

Originally Posted by hotshot

I've got a 900/385W LED on my plant at 13" from the top bud. There is no bleaching at this distance. According to the factory Par Meter, I am getting a little under 1900 PAR at the top bud, with no bleaching. So, my question is how much par would you have to shine on your bud to cause them to bleach out?

from what i've heard and experienced with both a 135w led and 600w, i reckon your measuring tape is off a little

**CityDweller** · 26-06-18, 02:57 PM

One thing i am noticing with the par meter and LED is that the par changes drastically with slight changes to the angle of the sensor while maintaining the distance. I am currently running a test on a clone. It is under a 12w led. When i check the par most of the clone is getting way too low of a reading. One leaf is getting around 1800 par. Lets see if this leaf bleaches.

pls excuse autocorrect. i am high of course.

**GEORGE** · 01-07-18, 05:56 PM

Originally Posted by ast.enthus

from what i've heard and experienced with both a 135w led and 600w, i reckon your measuring tape is off a little

That just goes to show we can't always believe what we hear and read some times. It was 13" 4 weeks ago, but has grown to within 11 3/4" since then, still no sign of burn on top bud.

**ast.enthus** · 01-07-18, 06:16 PM

those pictures don't show where you light is relative to the plant?

**GEORGE** · 03-07-18, 10:32 AM

Originally Posted by ast.enthus

those pictures don't show where you light is relative to the plant?

That single Cola was 15" over all the other buds. Here is the rest of the plant. 11" from tops, no sign of burn. That top cola's kelp the rest of the plant from getting any light. It mature in only 34 days of flower, Now I will try and mature the rest of the plant. lol

**CityDweller** · 12-07-18, 11:38 PM

1900 PAR with 12 watts and 5200 lumens did not burn the plant.
It is the lumens that burn the plants. If you get a decent led close enough the lumens will be way too high and burn the plant.
Optimal light distace would be where you have max lumens and max par without going over the par requirement as anything over is just wasted.
I have read that too much PAR will slow down growth. This is why the new COBS are so much better. Much higher lumens output so you can came within target lumens range while maintaining max PAR requirements.
My 2 cents.
Cheers.

pls excuse autocorrect. i am high of course.

**GEORGE** · 13-07-18, 10:55 AM

Originally Posted by ast.enthus

those pictures don't show where you light is relative to the plant?

The rest of the plant is about a foot or more down under that top bud. I was just thinking that with it that close to that one top cola, it would have burn it, but didn't. I don't know why, but it pull 385W on my meter, but when I switch over to my 400W HPS, my light bill went down quite a bit. I think something was wrong with the LED, just don't know what.