What is the light spectrum curve absorbed by cannabis

[cture]

Need a light spectrum absorbtion curve for cannabis, need it for my diy led lighting with 100% PAR efficency. I think it will be intresting for us to see how the plant will grow and etc...

[the yeag]

12-15 inches away

[cture]

its enough to get in to and rip you appart
Thank you the yeag.
Anyone else?

[JackdaWack]

what is the lumen out put on these leds your using. and u want 400-700nm(all colors of the spectrum) for veg and 530-700(red color of the spectrum) for flowering

[4x5]

most of the 520-720nm range can be generated by heating up your toaster-oven, or even a remote control for your tv, near-infrared is generated in massive quantities by most standard HID lamps; heck you can even buy film sensitive to most of that range. Your toaster oven will generate more lumens in that red range than any led, not to mention any HPS would blow the toaster-oven away.

[cture]

Guys! I really need a cannabis photosynthesis light spectrum. All the rezult's later, with photos and great grows. What I can say i z that i will use all colors in various proportions according to the uneque cannabis photosynthetical light spectrum to achieve greater rezults, with possibility to to modify ligth spectrum according to the growing stages and other conditions. All i can say iz that I plannig on to make 100% PAR efficient lamp, with 100000 hours life time (about 11 years) for a reasonable price with NO ANALOGS on the net! Cause I had had enough with HPS !!!

So please, do flood about light spectrum fotosinthetical curve for cannabis.
Thank you

[Volker]

Here is a chlorophyll activity by wavelngth chart (http://www.yahooka.com/forum/showpost.php?p=444409&postcount=3) in K rather than nm. (Spectra in bulbs are usually shown as K rather than nm)

Learn it. Live it. Love it.

[Volker]

All i can say iz that I plannig on to make 100% PAR efficient lamp, with 100000 hours life time (about 11 years) for a reasonable pricePS... good luck with that! :D

[invision]

light spectrum is 5000-6500K for veg

2100-2700K for flower

[harris7]

None of this is waht he's looking for. The good one posted is for generalized plants, ie not specific to cannabis.

i'll take a look around see what i find.

[harris7]

I have one chart on reflectance. The opposite of absorption. I may be of some use.

http://en.wikipedia.org/wiki/Cannabis_%28drug%29_cultivation
(itâ??s 75% down the article)

Cannabis has a very unique reflectance and because of that police can use high tech cameras to detect cannabisâ??s unique reflectance. They use it to find small outdoor grows via helicopters.

This unique reflectance makes me think it has a unique chlorophyll absorption and thats why i wouldn't trust the generalized info. Itâ??s just such a unique plant in every aspect

[JackdaWack]

Cannabis aint any different then most flowering plants, so a chart for a plant that flowers will be pretty close. PAR stands for the light range absorbed by plants, for veg you want pretty much an equall amount of all light 400-700nm with more blue, and for flowering you would use more of the higher ranges around 550 and up to 700nm. Dont try and break this down to a science you will not recieve the results you want, An hps will do the job much better in my opinion they have the best spectrum u need to flower with mucho lumens.
does this help at all?

[4x5]

Try google book searching john cervantes, strange to think everyone used to use halogens and quartz lights to grow 25 years ago....