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InvisibleNarkedAt90ft
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Registered: 12/04/13
Posts: 149
Loc: Marianas Trench
T5HO lighting proximity to cacti seedlings?
    #19303332 - 12/20/13 02:59 PM (10 years, 1 month ago)

To any of you out there using t5HO lamps, how close to L. and T. seedlings do you place them?

Using a 4 lamp x 4ft t5HO 6500k 5000 lumen per lamp.

Have not germinated as of yet, will be after xmas along with my chili pepper starts.

Thanks in advance.


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ni·tro·gen nar·co·sis noun - a drowsy state induced by breathing air under higher than atmospheric pressure, for example, in deep-sea diving. Also known as Rapture of The Deep.

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Invisibleferrel_human
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Registered: 06/26/09
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Re: T5HO lighting proximity to cacti seedlings? [Re: NarkedAt90ft]
    #19303437 - 12/20/13 03:18 PM (10 years, 1 month ago)

Try 6 to 8 inches and adjust accordinly. When i first started growi g lophophora i had the setup super close to my seedlings and they kinda shriveled at first but did survive. And they grew great. I would only recommend lights til they are old enough to get some real sun


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Nature is my church and walking through it is gospel. It tells no lies and reveals all to those who look, and listen, closely.
-Karode


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Invisibleferrel_human
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Re: T5HO lighting proximity to cacti seedlings? [Re: ferrel_human]
    #19303443 - 12/20/13 03:19 PM (10 years, 1 month ago)

I should also mention i was using a four foot shop light from walmart. T12


--------------------
Nature is my church and walking through it is gospel. It tells no lies and reveals all to those who look, and listen, closely.
-Karode


Looking for Mimosa tenuiflora seeds. Buttons for trade


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Invisibleverbage
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Registered: 11/02/13
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Re: T5HO lighting proximity to cacti seedlings? [Re: NarkedAt90ft]
    #19303586 - 12/20/13 03:47 PM (10 years, 1 month ago)

I do not know about lophs but for trichs and other species my lights are about 14 inches away with 70% shade cloth between it and the humidity dome.  I am running 4' × 6 54 watt t5 ho for a total of 30k lumens.  The ones under my MH bulb are even further away.  My guess is you have a heat issue.  T5s put off just as much heat but over a dispersed area.  My temps reach close to 90 during the day at 14 inches.  House A/c stays at 75.

Edit:  Guess you can't have a heat issue if you haven't sown yet :smile:


Edited by verbage (12/20/13 03:56 PM)


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OfflineLSoares
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Re: T5HO lighting proximity to cacti seedlings? [Re: verbage]
    #19306091 - 12/21/13 01:58 AM (10 years, 1 month ago)

You could solve some of the heating issues by housing the ballasts away from the tubes (under the trays, for example). I did that when I was living on a ground floor apartment with no balconies on a rough neighborhood and had to build a terrarium to grow orchids. I used 4x4' T8 tubes and the ballasts were housed in a wooden box under the terrarium. Get help from a knowledgeable guy, but it's not hard to do.

I wonder if the extra output from HO tubes is worth the extra money you pay for it?


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Z. in sunny Lisbon, Portugal
Cactus grower particularly fond of north american miniatures.
http://jardineiroazelha.blogspot.pt/

Sowing cacti - my way!
Random pictures of my collection.
Photographing cacti, Z's way.


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Invisiblepsi
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Re: T5HO lighting proximity to cacti seedlings? [Re: LSoares]
    #19306853 - 12/21/13 08:21 AM (10 years, 1 month ago)

Quote:

LSoares said:
I wonder if the extra output from HO tubes is worth the extra money you pay for it?




I have wondered this too. I guess it's worth it when the required light intensity is not achievable any more with things like T8. With Trichocereus that doesn't take all that long. I'd love to get a 4x4' T5HO fixture to experiment with but I can't spare the money or the space right now.


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Invisibleverbage
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Re: T5HO lighting proximity to cacti seedlings? [Re: LSoares]
    #19313675 - 12/22/13 09:02 PM (10 years, 1 month ago)

I'm unsure about this but my gut tells me yes the money is worth it.  I say this after comparing others seedling photos to mine.  Ive seen several people with 2 month old seedlings that are stretching and just starting to get real spines.  These folks usually have cheap lights with low wattage and lumen output.  I use both MH and T5 ho lights that average around 400 watts.  I personally prefer the flouros because MH output diminishes rapidly and the flouros do not.


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InvisibleCorporal Kielbasa


Registered: 05/29/04
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Re: T5HO lighting proximity to cacti seedlings? [Re: verbage]
    #19313747 - 12/22/13 09:21 PM (10 years, 1 month ago)

I don't quite get why a MH HID would diminish more then a T5HO  maybe its because the length of the bulb and how close it can light the canopy evenly?  Vs having a HID further away and creating a curve to the light strength?  I never counted it I just figured each had there place and space.  Flat area HID, shelves tubes or whatever is low profile.

First time using the T5's this season and I dig them. I should have just gotten the ballasts and bulbs and built my own hood. Thinking I will still with what I have.  I got two 2 light fixtures for the shelf.  I'm gonna crack it open and check the ballast and see if I can maybe run another bulb or two on it.  I doubt they over engineered the system but it would be nice.  That way I could put 3 or 4 bulbs per ballast and beef up the foot print.


Edited by Corporal Kielbasa (12/22/13 11:34 PM)


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InvisibleNarkedAt90ft
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Registered: 12/04/13
Posts: 149
Loc: Marianas Trench
Re: T5HO lighting proximity to cacti seedlings? [Re: Corporal Kielbasa]
    #19314126 - 12/22/13 11:10 PM (10 years, 1 month ago)

Many thanks for all the replies, I think I might try 10in ..with a little cheesecloth for shade?

As for are T5HOs worth it? VERY MUCH SO. They are awesome. Buy them at Home Depot and they're way cheaper than those at the hydro shops. I got mine for $120 + $25 for all four tubes.


--------------------
ni·tro·gen nar·co·sis noun - a drowsy state induced by breathing air under higher than atmospheric pressure, for example, in deep-sea diving. Also known as Rapture of The Deep.

Let's Trade!


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