posted on Aug, 15 2011 @ 04:39 PM
reply to post by unsolicited
I'm no botanist and a pretty average gardener but I'd believe that to be correct. Stomata openings are usually on the top of leaves too, so that'd
make sense. Curved leaves and side branches could be game though. I'll try it intracanopy facing down with tomatoes when they're going and see how
it works with them in particular. 'dreams of fresh tomatoes'. Intense blue light causes ridiculously dense internoding, so intracanopy lighting is
more effective in these cases (with led) than on usual sunlight 'stretched' internode sizes.
reply to post by AlwaysProNeverAnti
They could be using natural predators to control bugs? Just a thought. Filtered air and other precautions helps these systems immensely. Stopping
mother nature is a tricky game.
Regarding your flowering statement, this was very true until mid 2010, now
have taken HID/MH to school for flowering. They're 37% efficient at moderate loads and chuck out a tonne of micromols or ue/m2 right on
absorbtion peak. The pdf states 40% decrease in power usage over traditional existing setups and a several thousand square meter area was converted.
They also stated flowers fetched higher price as they had more buds than normal. Obtaining these leds in non volume quantities is nearly impossible
Most non custom, commercial LED products for either general illumination or growing, appear to fall short in design and technology implemented. I have
heard of many disappointments like you have mentioned. However I have also closely studied the successes. Sucessful led arrays (for horticulture) are;
either built within the last year using the latest leds and reliable design (which have tipped the scales finally); or built rather expensively prior
to this but using a huge amount of leds, under driven to increase efficiency or overdriven and less of them to obtain required light levels at lower
cost. Most commercial products do not provide enough light for the application in question, especially grow lights using no name leds from china. Reap
what you sow.
reply to post by Daedal
Interesting comments regarding taste and how you work your setup. Could you elaborate more on the nutrients you use? Surely there is still some
difference in taste between soils' trace elements and a good hydro setup. I don't discount that you can get excellent flavour from hydro setups,
just that many commercial enterprises get blamed for 'watery flavourless fruit and veges' because they focus on yield and not quality in hydro
setups often. That being said, some baby leafy veg (rocket/letteuce/etc) I tried from a local producer were stunning and without a single hint of soil
to wash off, especially positive for high end reasturants.
I need to sleep but I'll dig up some longeivity data later on to disprove the 15,000 hour comment made previously. It is data from the 1st
generation, smd chip, white high power leds. They have exceeded 20,000 hours in testing already and current degradation levels put them above
specifications (50k hrs @90%). It's all temperature and drive current based really. Most cheap led designs suffer from heat degradation, plus
sub-standard leds and drivers in the first place.