The conversion factor is quite easy to determine if you know SPD of a light source.
Seems to me that Americans tend to use higher PPFD than most people in Europe. It also occurs to me that Americans are much more sativa oriented. Do sativas require higher PPFD?
It appears that about 400w of cobs per meter at 100 lm/w (40000 lux) would be about 600 PPFD then. For 1000 you're probably looking at about 600w per meter, ironically just like the standard HPS recommendation.
Basically yes. I wouldn't recommend to replace a HPS with a 100 lm/W LED, though.
Yeah but that's what the CXB cobs are, if you buy stock high bays. They drive 12 of them at 220v and 1049 ma. It's the small cobs, about 3/4" diameter. It definitely performs better than equal wattage of HPS. It's not the lm/w that really matters, it's what spectrum those lumens are composed of and whether they are being produced steadily by a DC power supply or quickly strobing on AC like HIDs do.
That's why I don't use stock high bay lighting for growing.
This is an interesting statement & quite true from my observations. Seems backwards that we blast our rooms when space in so abundant here (generally speaking). While in Europe, they are more conservative in PPFD when space is more expensive and more limited.
and WHO uses them for growing?
People who don't want to have to mess around building electrical equipment. I went for the off-the-shelf solution. It's working perfect though, and no noisy fans. One 12 cob CXB high bay is just right for a 3'x1.5' cab. You just put the whole unit on top of the cab with a hole cut. All the heat is outside the cab. The aluminum reflector aids the main heatsink by acting as more surface area.
I think power is cheaper in US compared to Europe
You forgot big boobs and butts!
Maybe I missed it, whats the ~PPFD for the area you flowered in? Anymore larfy/leafy than higher intensities? Most BD crosses dense up pretty nice on their own. Just curious if you have run the same strain under the same/similar lighting at higher intensity.
Sounds great, looking forward to seeing those numbers! I think you're right as far as being among the first to hit those numbers... but I would be surprised if people don't start hitting 2+ GPW with 3590s. Can't remember who as it's been a few months but someone I thought trustworthy mentioned 1.8 GPW. More of that coming in from respected growers and video evidence will only be a good thing.
I would love to get 1g/W
That is impressive! You mentioned earlier that you ran your light bars with lens about 24” above the canopy. Without spending a huge amount of time can you give me a range in lux that your canopy was seeing about 24” below the lights? I too am running passive light bars at 700ma but with Vero 29s WITHOUT lens…so I am very interested in the lux levels you were seeing to get the kind of results you are getting. I may have to order some lens! Thanks.
