Effects of differing wavelengths of light on cana growth.

[burnt_toast]

The way I see it, most weed is a hybrid of long flowering sativa's and short flowering Indica's.

The Sativa's have evolved to be lazy. They dont have to rush because they have such a long growing season where they are from.

The Indica's are from the mountains though where life is a bit harsher. Also, there is a thinner atmosphere and a lot more UVB.

So really, I would have thought that you'd have to tailor a specific schedule for each variety.

Perhaps there is a catch all, but as someone else mentioned about NYCD, increased strength from a sativa MAY be harder to achieve.

I think the only way any of us is going to know for sure would be to get access to a gas chromatography kit, but unless you work with these, the cost might be far too high.

Im sure over in the states or canada, you might be able to secure the services of a testing company for a fee...

That or use one of those canna-fingerprint kits, but I have no idea how accurate they are.

[iky]

HI peeps like to join you on this one if I should be so bold.My current grow, hydro some buds in pots(side of grow} Attic grow.2-5 foot tanks withing a wooden frame.adjustable side shelf. 3-400w hps. I tie the plants down to bungee cords, like a scrog.

I bought 12 36w led panels from China was going to build a box with all round led light and experiment a bit with combo lighting.Had a bit bit of hassle of the plods and never got to doing it.Took 4 panels made them into 1 strip and put them next to my shelf,was doing the pot noodle thing next to my 7 NL --1 lemon grow.

The buds on the side with the panel look better than the other side.I also have a 60w led bulb shining on 1 corner where the hps is not bright , the buds in this corner look a lot better than the opposite corner

the buds are leaning towards the led panel-the buds down the side , out of a lot of hps light but receiving led,look good.

this is the one in corner was only small will update this shot later to show difference now.

to join the discussion, it looks like led lighting may be a useful addition to lighting combination ,Lots deride leds, mo it is a bit like when hps took over from fluorescents,the armchair experts said they were too hot and were no good.I think that they were treating hps like fleu and putting them too close.the opposite is happening with peoples use of led,they need to be close not hps distance,within 12 inches at a guess?.

My observations on stretch are not related to lighting type but to the length of dark being the dominant factor.

Plants in norther hemisphere are short, equatorial are long.Sativas are stretchy with thin leaves, Indica grow shorter have broader leaves to capture more light.

I grow my mothers,cuttings ,seeds and regens under24 hrs to keep them small.have done for about 10 years,no problems

I grew the lemon from seed under 24 hrs it reached 6 nodes.put it into flower and it went mental.have taken10 or so tops off.it is now 12inches above my grow,10 more came through .Had a regen prob so will suck it and see what happens,

stretch will occur when the lighting is changed for flowering, the plants stretch in the dark looking for light I can trigger my NL into flower at 11 hrs dark,cuts the stretch a little.

I really know my NL had it for 16years this year,used to pot grow,age and arthritis sent me to hydro(easiest for me)still potter a bit,love it.

So Randy the addition of length of dark to your stretch and lighting calculations may be helpful.

good growing peeps iky[

attachment=368364:mad_lemon_s.jpg]mad lemon taking over my regenerated corner####

[PauloLx]

Hi there!

I´m starting to wonder if the UV spectrum may have something to do with the dificulties in growing landraces&Hybrids indoor

I got a couple of Ace genetics, that seem to thrive under mine Woods Lamps.

Since the day i got them under those the resin coat blasted and the plants went all fragant and sexy

I´m loving it, but do you guys think it as something to do with the UV thingy?

Or it was just a question of timing? after all they are flowering for 6weeks now.

I will try to report later on...

Peace

[iky]

Hi there!

I´m starting to wonder if the UV spectrum may have something to do with the dificulties in growing landraces&Hybrids indoor

I got a couple of Ace genetics, that seem to thrive under mine Woods Lamps.

Since the day i got them under those the resin coat blasted and the plants went all fragant and sexy :wink:

I´m loving it, but do you guys think it as something to do with the UV thingy?

Or it was just a question of timing? after all they are flowering for 6weeks now.

I will try to report later on...

Peace

What are mine wood lamps?new one to me, looks very interesting.Will do a google on them.uv,s

like your grow very nice. :wink:

[iky]

are you using any of these? can not find a uk site for them yet..Interesting mate.

Incandescent Blacklights

There are incandescent bulbs made with deep violet-blue bulbs which largely filter out visible light. Longer UVA wavelengths get through the glass and are not blocked by the dark colored filter dye. Most visible violet and some visible blue light get through, as well as a wide range of infrared and the longest, less visible of visible red wavelengths. Some traces of other visible wavelengths get through.

These bulbs are a convenient source of some UV to cause fluorescent paints, dyes, and other substances and objects to glow. Most of such fluorescent objects (especially magenta, red, pink, orange, yellow, and green ones) also glow from visible violet and blue light.

These bulbs are quite safe, although it may not be a good idea to stare into one from short distances for long periods of time. They generally have hotter running filaments that last only about 500 hours or so.

Fluorescent Blacklights

There are fluorescent tubes that emit UV. The phosphor coating on the inner surface of the tube absorbs the UVC emitted by the low pressure mercury arc, and emits longer UV wavelengths. There are at least six different UV-emitting phosphors used in fluorescent lamps.

One common lamp is the ""BLB" fluorescent lamp. The tubing is made from a very deep violet-blue glass known as "Wood's glass". The tubing is quite transparent to medium and longer UVA wavelengths, and shorter visible violet wavelengths, and a fairly broad range of infrared and the longest, least visible red wavelengths. These tubes emit lots of UV mainly between 350 and 375 nanometers, some of the 404.7 and dimmer 407.8 nM violet mercury lines, and just enough of the blue 435.8 nM mercury line to have a basically blue color when lit.

The "BLB" lamps are used for special effects due to their ability to make fluorescent objects glow very brightly.

There is a less common deep-blue-violet lamp with no phosphor and made with special glass (maybe quartz) to transmit the 253.7 nM UVC (shortwave UV) mercury line. These lamps are generally used to make fluorescent rocks glow.

There are UV fluorescent lamps with glass not dyed to block visible light. This includes the BL and the similar 350BL. These are often used to attract insects into electric insect killers. The 350BL has a broader spectrum peaking at a slightly shorter wavelength (350 nanometers) than the BL does, and is supposedly more attractive to insects than the BL.

There are other ultraviolet lamps such as UVB medicinal lamps and UVA suntanning lamps.

There are also the similar fluorescent actinic lamps, producing long UV wavelengths and/or visible violet. These are sometimes used in some special photographic and printing processes. One of these is the 03, specializing in producing visible violet light. The 03 is also used in reef aquariums with live coral since coral utilizes violet and deep blue wavelengths. The 03 actinic will cause fluoresc

[PauloLx]

Hi there Iky!

Woods Glass: Wood's glass was developed by Robert Williams Wood (1868–1955) as a light filter used in communications during World War I. His "invisible radiation" technique worked both in infrared daylight communication and ultraviolet night communications. His glass filter removed the visible components of a light beam, leaving only the 'invisible radiation' as a signal beam. Wood's glass is commonly used to form the envelope for fluorescent and incandescent ultraviolet bulbs ("black lights").

Woods Lamp: A Wood's lamp is a diagnostic tool used in dermatology by which ultraviolet light is shone (at a wavelength of approximately 365 nanometers) onto the skin of the patient; a technician then observes any subsequent fluorescence. For example, porphyrins — associated with some skin diseases — will fluoresce pink.

Taken from the Wikipedia

Peace

[iky]

Thanks for that mate,what period of the grow did u use these lights/Full grow/part grow.

Just sent for 2 uv black light bulbs from the glow company.do not know if they are the same only 16.94 each.so will experiment on my next grow.

Had a look in your gallery mate nice healthy product there mate. no black light shots though(dissapointed),

I am sure Randy will be interested or may have info on black /woods lighting.best wishes Er ic

[PauloLx]

I will post some black light shots asap.

Have you checked my AceMix thread?i think there are some black light shots there

I´ve used those lamps only while flowering. I introduce them around the 4th week of flowering.

I´ve bought those lamps in a online lamps specialist. 12quid for 3lamps quite cheap but my plants seem to like it

Thx for the kind words

Peace

[PauloLx]

Pics of the Woods Glass lamp thingy...

Peace

[Russkya]

UVB light is a stress on Cannabis and typically increases resin production and THC content, some studies suggest by up to much as 35% in flowers and up to 45% in leaves.

The bulbs previously talked about [black lights] etc are no good as they are filtered... What that means is (Pretty much what it says on the tin) that if it were not for the filter it would be emitting regular light, they place a filter on it so it can be used for raving, dermatology and finding semen on that hotel bed you're about to sleep on. It doesn't add any more UV than any other particular bulb of it's type - just the rest of the spectrum is blocked out.

Anyways after a little research it would appear the bulb that you want to use is the Philips FS40T12 UVB broadband and hang it around 6 inches from your canopy. This acheives a UVB irradiance of 250 µW/cm2 similar to noon sun at sea level. For certain landraces it is supposed that greater UVB radiation would be needed/helpful considering the altitude at which they are native, ie at about 9000ft above sea level UVB irradiance can be over 550µW/cm2. How one would reliably get such a bulb 6 inches from the plant canopy without interfering with the main body of PPFD light from the HIDs is up to the DIY people out there, maybe a little light mover or something would do it.

[iky]

thanks for that info russkia. very informative.

[PauloLx]

thanks for that info russkia. very informative.

Seconded!

Thank you Russkia

[david zap]

thanks for that info russkia. very informative.

Seconded!

Thank you Russkia

UVB is present in daylight. Do you really want to omit UVB from your cannabis? If you want max strength cannabis replace the UVB when you grow indoors. Lizard lamps are fine. ZOO-MED Repti-Sun

is good and easily available at pet shops. I grew for several times without it and was dissatisfied with the buzz. Adding UVB will make an appreciable increase in potency of your bud. Remember, thats what

God designed.

[Randalizer]

A few words on using UVB. First off be careful. Use long sleeved shirts, gloves and UV blocking sunglasses when working around UV. Two, one can find UV spot lights. This may increase the amount of distance one can use from lamp to plants.

Three, there are charts on the web for UV exposure at differing latitudes and elevations.

And lastly, if you are going to use UV, a UV meter would be a wise investment.

[PauloLx]

Safety first of course!

But i wouldnt grow any long time flowering sativas without some extra UVBs

They just love it and you can´t compare the resin production and the potency of the final product

Just my opinion after a couple of runs with and without UVBs