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 lighting question

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San Rainbow
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PostSubject: lighting question   Sun May 11, 2008 6:55 pm

Hi all I am going to be growing some cacti from seed, thanks to you all I have made the right decisions on heat mats, propagating sand, food and procedures.

now for the light question...

this add on to the house will be the area where it will be taking place, as you can see that it has that plastic corrugated roof ( its the cloudy type not the see through type ) which lets in light, its probably no as light as I would like it but it will have to do.




should I add more light?

UV or fluorescent?

I have a little UV light that I have hung over the growing area will this help or is it a waste of time?
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trigonus
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PostSubject: Re: lighting question   Sun May 11, 2008 7:02 pm

Not sure about the UV, someone will know. Fluros are usually used, if I was you I would trial atleast one seed tray and see what results you get without a light, the light in that little area might just be sufficient, and if the experiment succeeds you will save a bit on your power bill etc.

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San Rainbow
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PostSubject: Re: lighting question   Sun May 11, 2008 7:07 pm

trigonus wrote:
Not sure about the UV, someone will know. Fluros are usually used, if I was you I would trial atleast one seed tray and see what resultrs you get, the light in that little area might just be sufficient, and if the experiment succeeds you will save a bit on your power bill etc.

yea probably the best idea, I have seen those energy saving fluorescent
big coil (bigger than the one pictured above) lights in hydro shops
would that work?

why fluorescent? is it a special type or fluorescent light ?


Last edited by San Rainbow on Sun May 11, 2008 7:10 pm; edited 1 time in total
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trigonus
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PostSubject: Re: lighting question   Sun May 11, 2008 7:10 pm

Not sure, probably wouldn't be too bad. I think most people seem to use cool white tubes, 2x 30cm tubes I think.

I can't really use any lights unfortunately, wish I could.

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slim6y
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PostSubject: Re: lighting question   Sun May 11, 2008 7:12 pm

As far as I am aware, that type of UV light is unproductive at a distance greater than 15cm. Therefore unless you had plenty of them, I don't think they'll have an effect.

the use of a similar UV fluro tube increases the spread of light, but is still only productive when within 15cm of the subject.

Nothing beats the good ol sun aye Smile

So, check out what other grow lights you can get, there's plenty out there.

I used to use mecury vapour bulbs (very bright and very hot) they emit a near full spectrum, much better than just the UV.

Still... UV is normally the one thing that's missing behind glass, yet most plants grow well under glass Smile

Full spectrum is better IMO.
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San Rainbow
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PostSubject: Re: lighting question   Sun May 11, 2008 7:15 pm

slim6y wrote:
As far as I am aware, that type of UV light is unproductive at a distance greater than 15cm. Therefore unless you had plenty of them, I don't think they'll have an effect.

the use of a similar UV fluro tube increases the spread of light, but is still only productive when within 15cm of the subject.

Nothing beats the good ol sun aye Smile

So, check out what other grow lights you can get, there's plenty out there.

I used to use mecury vapour bulbs (very bright and very hot) they emit a near full spectrum, much better than just the UV.

Still... UV is normally the one thing that's missing behind glass, yet most plants grow well under glass Smile

Full spectrum is better IMO.


do they need a special housing to hold them?
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trigonus
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PostSubject: Re: lighting question   Sun May 11, 2008 7:16 pm

Quote :
Nothing beats the good ol sun aye

Except when propagating cactus seedlings, sunlight is garanteed death to cacti seedlings.

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slim6y
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PostSubject: Re: lighting question   Sun May 11, 2008 7:17 pm

trigonus wrote:
Quote :
Nothing beats the good ol sun aye

Except when propagating cactus seedlings, sunlight is garanteed death to cacti seedlings.

True, but it's still he good ol sun whether it's behind shade cloth or in front of it Smile
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trigonus
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PostSubject: Re: lighting question   Sun May 11, 2008 7:19 pm

Or direct sun rather.

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San Rainbow
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PostSubject: Re: lighting question   Sun May 11, 2008 7:19 pm

trigonus wrote:
Quote :
Nothing beats the good ol sun aye

Except when propagating cactus seedlings, sunlight is garanteed death to cacti seedlings.


how old are the seedlings usually when you start introducing sun light to the cacti?
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trigonus
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PostSubject: Re: lighting question   Sun May 11, 2008 7:20 pm

True.

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trigonus
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PostSubject: Re: lighting question   Sun May 11, 2008 7:22 pm

Direct sunlight? Can be anywhere from a year to two years usually, sometimes less depends on the seed and how much light exposure they are already used to.

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calycium
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PostSubject: Re: lighting question   Sun May 11, 2008 8:18 pm

Light: "Real" sunlight is best over lights, but it varies for summer winter.

Summer - clear plastic 99.9% emitting is good (keeps out the rain) so that you can water in a controlled environment. Then add 50% - 75% shade cloth depending on where you live. You will need some sort of shade cloth. I started with 50% and burned some of my Gymnos and Lithops, but my bigger plans did ok. I added another layer of 50% and this gave me around 75% shade, which is where I put my seedlings over summer.

Winter - You DON'T need light to germinate them, but once they have germinated, they want light. Fluro's are good - up close 15cms to get heat and some light onto them, but eventually you will have to wean them onto sunlight. I just move mine after they have germinated in their baggies into filtered light and gradually open up the bag to reduce the humidity.

Looks like you have about 40 - 50% light without shadecloth, so I would probably lean towards lights in winter - fluros and in summer, just leave it without shadecloth.
But as per Trigs advice - try a tray of less prescious seed first.
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San Rainbow
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PostSubject: Re: lighting question   Sun May 11, 2008 8:39 pm

cheers guys! Very Happy

are all fluro's adequate or is it a specific variety?
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calycium
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PostSubject: Re: lighting question   Sun May 11, 2008 8:50 pm

What can I say - fluros aren't fluros:

but, cool white tubes would be good.

Fluros at 15 cms - heat and light would be a good start during autumn / winter.
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sacred pedro

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PostSubject: Re: lighting question   Sun May 11, 2008 8:56 pm

dont the seeds need light to know which way to grow when their germinating? Question
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slim6y
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PostSubject: Re: lighting question   Sun May 11, 2008 8:58 pm

sacred pedro wrote:
dont the seeds need light to know which way to grow when their germinating? Question

So they say, but in combination with gravity and pressure, they find the way - otherwise many of our forest trees wouldn't be able to find their way to the canopy.

Light does help at germination point.
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San Rainbow
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PostSubject: Re: lighting question   Sun May 11, 2008 8:59 pm

calycium wrote:
What can I say - fluros aren't fluros:

but, cool white tubes would be good.

Fluros at 15 cms - heat and light would be a good start during autumn / winter.


sweet Very Happy
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sacred pedro

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PostSubject: Re: lighting question   Sun May 11, 2008 9:07 pm

once germinated, is the light used as a source of heat ie standard globe or does uv come into play. i use the mercury vapour bulbs for my snake, thinking theyd be pretty full on for seedlings though?
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slim6y
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PostSubject: Re: lighting question   Sun May 11, 2008 9:13 pm

god, i hope you don't use mecury vapour bulbs over night for your snake - the poor thing will wish it was blind :p

I used to use mecury vapour bulbs and fans to grow tomato plants 4 or 5 times quicker for experimentation purposes. You could literally watch them suck water up!

Yes, they'd be full on at close range for seedlings.

I'd suggest they're full on for a snake to!
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sacred pedro

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PostSubject: Re: lighting question   Sun May 11, 2008 9:28 pm

only for daylight and heat, i have a pretty deep tank, and he still chooses to bask under the light which is about 40cm away from his basking spot. come to think of it, since ive been using these lights his probably grown 5 times as big. heas only 4 and he's nearly seven foot long!
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calycium
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PostSubject: Re: lighting question   Sun May 11, 2008 10:13 pm

Try it on some test seedlings, from what I got told about those lamps and cacti seedlings they will burn to a crisp
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Hellonasty
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PostSubject: Re: lighting question   Sun May 11, 2008 10:20 pm

On the issue of light and seed germination. Water, warmth and oxygen are the only fundamental requiremetns for seed germination. With that being said there are plants that require at least "some" light to trigger the pre germination process.

With cacti seed I have found that light will trigger the pre germination development, it also accelerates germination as it occurs. I am of the firm belief that light is necessary to trigger germination many cacti seed and when light is utilised especially natural light a far greater germination % will be achieved.

As to which cacti rely on light to trigger germination I have no info on but would expect germintion to increase in many if not all species. As stated earlier I also believe natural light produces much better results.
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Lanna

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PostSubject: Re: lighting question   Thu Jul 03, 2008 12:53 am

I use a combination of cool white flouros and gro-lux flouros in equal amounts over my seedlings with very good results.
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