10 replies to this topic

[mantrid]

Found this site
http://www.greenligh....uk/default.htm
Can anyone with experience of this type of lighting tell me if these models sound a bit expensive

[Dicon]

I can't speak for these particular ones, however, with LED's you do need to spend a couple of hundered on a descent light, the cheap panels on ebay are not usually up to much unless you just grow seedlings. The info in the website you gave is not very "deep"
Also the output and consumption figures are a bit contradictive. (100 x 3w chips is not a 300w lamp, as they do not actually drive at 3w)
Read up and read some more!
IMO Led's are the way forward but like all new technology, if you want it early it will cost you.
BTW not everything good comes from China.

[manders]

I did notice that this site does actually quote the real power consumption not just the number of leds x faceplate wattage.  As dicon says its a maturing technology and needs to settle in for a while in my view, still not sure what the point of IR leds are (ie heat) the whole point of led efficiency is they produce less heat surely?   Aint pointless marketing great.

Cheapest you can get is around 1£/w, so these dont look overpriced compared to a few years ago, but they should get cheaper and better in the next few years.

[mantrid]

manders, on 22 May 2012 - 21:43 PM, said:

... still not sure what the point of IR leds are (ie heat) the whole point of led efficiency is they produce less heat surely?   Aint pointless marketing great.

The info on the site states
"IR 730nm. Large chlorophyll absorption occurs, and most significant influence on photosynthesis to promote flowering and budding.  And by adding IR 730 you ensure that your plants do not stretch."
Dont know if this is fact or just sales bull

[manders]

mantrid, on 22 May 2012 - 22:10 PM, said:

The info on the site states
"IR 730nm. Large chlorophyll absorption occurs, and most significant influence on photosynthesis to promote flowering and budding.  And by adding IR 730 you ensure that your plants do not stretch."
Dont know if this is fact or just sales bull

I'm not sure either, i've been seeing ir advertised in led lights for a while now but as far as i know, photosynthesis basically stops at before 700nm, althought i think light at 710nm suposedly has some synergistic effect, but IR starts at ~740-750nm.  Does 730nm help? I have no idea.  Plants seem to grow perfectly well under blue/red LEDs only.

Maybe 730nm has some particular impact on marjhuana buds?

I do like LEDs in general and if the build quality is good on these they might be a serious competitor to a HPS.

Edited by manders, 22 May 2012 - 23:08 PM.

[manders]

The same lights are on ebay much cheaper and from the same supplier.

[gardenofeden]

manders, on 22 May 2012 - 23:07 PM, said:

Maybe 730nm has some particular impact on marjhuana buds?

IR boosts the levels of THC, these lights seem designed for cannabis growers!

[mobile]

gardenofeden, on 23 May 2012 - 11:58 AM, said:

... these lights seem designed for cannabis growers!

Yep, I think the low heat signature is an advantage to them.

[miso]

any led bulb has very limited spectrum/wavelenght. so if you plane to do some light seriously, best to combine as much as possible different wavelenght leds, build own lamp personally. i plane to do it few years and it probably take another years when i will be able to find the time to realize it .

[MerryBrowen]

As dicon says its a maturing technology and needs to settle in for a while in my view, still not sure what the point of IR leds are (ie heat) the whole point of led efficiency is they produce less heat surely?



--------------------
led downlight
LED Fluorescent
led strip lights

Edited by MerryBrowen, 09 July 2012 - 06:17 AM.

[greenlightsled]

Hi there

Paul from Greenlights Led here to answer some of your questions:

We do have an LED information section and FAQ section on our website with answers to some of your questions already there:

Why Infra Red?
Infra red is absorbed in photosynthesis and does not generate any noticeable heat.  The IR has been proven to stop plants stretching so much, this is why many led grow lights have IR 730nm in them today.

This is fact we have growers reporting back that they have no stretching even when using the little strip lights in veg.

Ebay?
We sell some items on ebay these are:
End of line items that we no longer stock.
Dented or scratched items.
Items that have arrived faulty and been repaired.

We would never send out a repaired or dented item as in our opinion these are second hand.

Colour Ratio / Spectrum?
The lights are a multi spectrum that is primarily designed for medical growers and chilli growers.   The two whites in each cluster one at 3000k and one at 9000k combine to give a little of every possible colour in the visible light spectrum, mainly to give you plants a little of every colour that they do not require so much as the reds and blues.

We can provide other ratios on request.

We have some diaries starting on our Budmaster site for you all to enjoy.

If anyone has any questions or needs any help regarding led then please feel free to contact us, our details can be found on the site.