PAR Meter question

[bullets]

I have purchased a Titan Controls PAR Meter. it says the reading should be 400 to 700 nm. the lights are on 600w right now when i turn the ballast to 1000w the PAR is above 800nm that's way too high. everyone keeps telling me that i need to have the lights at 1000w's but the PAR it way too high? how do you guy tell if your lights are set at the right height?

thanks in advance,

Louie

 

[Kite High]

ummm...the nm are the spectrums of light...has nothing to do with wattage

 

[dbkick]

with a light meter, it reads footcandles. I've been told by a "scientist" with a lamp manufacturer that 1000 is too much. also dimming will throw off spectrum. a user here did a test dimming a 1kw mh lamp , he said the results were the light was more blue dimmed.

 

[dbkick]

outdoors under the sun 5500 footcandles, indoors it can be pushed up to 7000. anything more and it causes photo-inhibition stopping photo-synthesis .

 

[Kite High]

outdoors under the sun 5500 footcandles, indoors it can be pushed up to 7000. anything more and it causes photo-inhibition stopping photo-synthesis .

this is a par meter it measures in micromoles not foot candles

and if that were the case then outdoors plants would be photo inhibited for 80% of the day as it is over 7000 ftc most of the day

1000 watts is not too much...you just need distance

 

[dbkick]

this is a par meter it measures in micromoles not foot candles

and if that were the case then outdoors plants would be photo inhibited for 80% of the day as it is over 7000 ftc most of the day

1000 watts is not too much...you just need distance

yes I know this, that's why I'm explaining to use a footcandle meter and if you'd like to argue with someone about 1000 watt lamps being too much you can simply email Dan at sunpulse lamps and see what his response is, I'm sure he's more educated than you or I.

 

[dbkick]

you just need distance

This being the key info in your post.

 

[dbkick]

quote from Dan at sunpulse.
1000w lamps are too much for plants and causes photo-inhibition, stopping photosynthesis. At around 5500 footcandles photosynthesis stops, in nature. You can push up to 7000 indoors, but that's max, and still causing some plant shut down. If you back the light up to 2', then you lose 3/4 of the lamps energy, a 1000w light will only put out 250w of usable energy at 2 feet, its called inverse square law - its just the physics of light.

 

[Kite High]

quote from Dan at sunpulse.
1000w lamps are too much for plants and causes photo-inhibition, stopping photosynthesis. At around 5500 footcandles photosynthesis stops, in nature. You can push up to 7000 indoors, but that's max, and still causing some plant shut down. If you back the light up to 2', then you lose 3/4 of the lamps energy, a 1000w light will only put out 250w of usable energy at 2 feet, its called inverse square law - its just the physics of light.

Dude Sunpulse are scammers. All they do to change their kelvins are manipulation of the green and yellow portions of the lamps spectrum which makes little if any difference to the plants. No sir I highly doubt someone who hides the truth about their product knows more than you or I. I M not arguing just simply stating facts dude. Also their claim of emitting UVB is a falsehood as tested with my UVB meter. They are using a glass formulation which blocks UVB as required by law if people are to be exposed to it.

Please do not blindly fall for manufacturer lies and spins on the truth. It will mislead you. IE Advanced Nutrients, Sunpulse etc.

 

[Kite High]

quote from Dan at sunpulse.
1000w lamps are too much for plants and causes photo-inhibition, stopping photosynthesis. At around 5500 footcandles photosynthesis stops, in nature. You can push up to 7000 indoors, but that's max, and still causing some plant shut down. If you back the light up to 2', then you lose 3/4 of the lamps energy, a 1000w light will only put out 250w of usable energy at 2 feet, its called inverse square law - its just the physics of light.

So why does Sunpulse have 1000 watt bulbs?

 

[dbkick]

So why does Sunpulse have 1000 watt bulbs?

because dan simply works there, he doesn't call the shots or they wouldn't. never said I stood by the lamps, I have several. hortilux is the brand I prefer.

 

[dbkick]

so what's your take on solis-tek lamps?tested any? sorry for getting off topic op .

 

[Kite High]

Haven't had any to test as of yet. But I have tested many many hid lamps and none tested emitted effectual amounts of UVB for our purposes.