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

  1. #11

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    The answer depends of course on how high your lights are so assume OP means as low as you can/dare get them. You could get a crazy flux density right next to the bulb where all the photons are concentrated

    The figure I understand is over 1,500 micromoles per sq meter per second for 11 hours. Over that is fatal allegedly

    500 umol/s/m2 will be min for basic flowering
    Over 1000 is deminishing returns





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    Quote Originally Posted by Benson123 View Post
    So in your opinion what par does the plant frive most at,as in say 400 to 1200,if you get what I mean!
    This depends on the light schedule and the co2. With regular co2. No co2 added on 12/12 lights i aim for about 500 Par. On 18/6 lights i aim for 350 Par. This is due to max mole per day and the lights being on longer

    With added co2 i increase par by 100 per 100ppm of added co2. My base co2 is about 450. With a few co2 bags i am in the 900's.

    My formula is not exact at all. It is a rough estimation based on the few light studies i have read. Most of which i can not understand so i might be way off. But then again my plants do grow very well when the bugs dont make an appearance.

    pls excuse autocorrect. i am high of course.

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    Quote Originally Posted by gardro View Post
    The answer depends of course on how high your lights are so assume OP means as low as you can/dare get them. You could get a crazy flux density right next to the bulb where all the photons are concentrated

    The figure I understand is over 1,500 micromoles per sq meter per second for 11 hours. Over that is fatal allegedly

    500 umol/s/m2 will be min for basic flowering
    Over 1000 is deminishing returns





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    thats what I don’t get about the mars led I got,it says 1700 or near as dam it,but that’s at 18in,so I’m thinking have the light fairer than 18 in,I’m I correct?

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    Quote Originally Posted by Benson123 View Post
    thats what I don’t get about the mars led I got,it says 1700 or near as dam it,but that’s at 18in,so I’m thinking have the light fairer than 18 in,I’m I correct?
    You got the big 1200w Mars so I would have it bit higher



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    you get diminishing returns with the higher power HIDs anyway because they just need to be hung higher ie 1000w vs 600w. not sure about leds though...perhaps the higher wattage is just for coverage.

    there is no point trying to guess - you need a par meter for this to test it with your own plants

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    Quote Originally Posted by ast.enthus View Post
    you get diminishing returns with the higher power HIDs anyway because they just need to be hung higher ie 1000w vs 600w. not sure about leds though...perhaps the higher wattage is just for coverage.

    there is no point trying to guess - you need a par meter for this to test it with your own plants
    id say that its hung about 14in atm with no signs of burn or leaf curl in any way,they look very healthy,but must be getting stupid par in the centre.

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    well I ain't having any problems with growth over 1000 par with c02 and have noticed positive results right through. 24hr veg, 12/12 now.

    I'm not familiar with the concept of max moles per day though - can someone elaborate on this? there are many with 600w hps bulbs right down as close as they can with an air cooled hood. One of the advantages of an air cooled hood is being able to put the light closer to your plants.

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    Quote Originally Posted by ast.enthus View Post
    well I ain't having any problems with growth over 1000 par with c02 and have noticed positive results right through. 24hr veg, 12/12 now.

    I'm not familiar with the concept of max moles per day though - can someone elaborate on this? there are many with 600w hps bulbs right down as close as they can with an air cooled hood. One of the advantages of an air cooled hood is being able to put the light closer to your plants.
    Running late so cant type out a book. Google "measuring plant lighting" top two results are pdf's. A bit difficult to read but some of the basics can be understood without being a scientist.

    Cooling hps allows you to get the light close enough to achieve a good par. Without cooling most people would struggle to use them with the heat output.

    My 600 hps measured at the glass hood cover which is about 4 inches from the bulb is getting 4000 par. Getting the light this close would be pointless. Even with added co2.


    pls excuse autocorrect. i am high of course.

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    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?
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    Quote Originally Posted by hotshot View Post
    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?
    Good question.

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