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Indoor Under Lights Grow Area

This is a discussion on Indoor Under Lights Grow Area within the OrchidTalk Members Grow Area - Photos forums, part of the Orchid Culture category; Has anyone had any success with T 12 / 40watts? Great set up Rich. Please ...

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  1. #11
    gardenguysorchids's Avatar
    gardenguysorchids is offline Don't be afraid to color outside the lines
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    Has anyone had any success with T 12 / 40watts? Great set up Rich. Please keep us posted.

  2. #12
    stefpix is offline Senior Member
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    I have a shelf with 4 T12 - reg cheap ones. But most of what I have under it is small seedling some almost touching the tube.

    I was considering a T5 from the hydroponic store. 2 tubes 2 ft 67 $. need to check the other store in Queens.

    Was wondering if they would provide enough and save me ConEd $$$.

    The photo store has also some bright CFLs 250 W equivalent for 7 $.

    Wondering if they are realistic in the output. I do not have a light meter anymoree. WOuld be good for testing all this stuff. Anyway for the winter my Ansellia africana will be on my window sill as it is getting too tall...

    stefano

  3. #13
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    bill, I use a few 4 foot T-12 shop lights under some of my basement shelves. I put the orchids that like higher temps just above those lights as they give off more heat them the T-8 bulbs. They also use more electricity than a T-8 or a T-5. I use a sunlight or wide spectrum bulb in my T-12 fixtures, but as the ballasts go out on these, I am replacing them with T-8's. My local big box store does not handle T-5 fluorescent 4 foot fixtures.

  4. #14
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    rich63 is offline Senior Member
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    Default Replaced 20" T-5 bulbs

    To answer the questions. The smaller 20" T-5 bulbs are only 14 watts, the T-8 bulbs seem to be putting out more light even though there are two T-8's. Since I do not have a light meter, I did try something. I stood in the same place pointing my digital camera at the back wall on the first shelf. Picture was F-stop 4.2 at 1/40 Sec. I did the same for the second shelf F-stop 4.2 at 1/100 Sec. The top shelf F-stop 4.2 at 1/80 Sec. I don't know if this means a lot. I'm sure that if I had two grow bulbs T-5 24" 24 watt in the top it would be better light production. The reflective backing has seem to help since I've put it up. I did include two new photos since I did replace the old 20" T-5 bulbs. Have Fun,Rich
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  5. #15
    stefpix is offline Senior Member
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    Cindiras,

    T12 are 40 W , T8 are 32 W. 20 % difference. Do you notice a difference in brightness among the standard T8s and T12s you can find at the home improv. store? given that they have a similar reflector

  6. #16
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    With a similar aluminum reflector, I do not notice a visual difference myself, but the plants do seem to notice. I had three catts rebloom under the T-12 daylight bulbs, and only two rebloom under the T8 bulbs. I went downstairs and looked. The T-12 sunlight bulbs are 34 watt, and the T-8's are 32 as you mentioned. Not much visible difference to the human eye. I should look for wide spectrum T-8 bulbs and test them.

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    stefpix is offline Senior Member
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    what was the distance between the rebloomed Cattleyas and the tubes? And how tall are those Cattleyas? If the fluorescent tubes are 1 year old I noticed an evident loss of brightness compared to new ones

  8. #18
    cindiras's Avatar
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    Yes, the loss of brightness is another reason I need to go bulb shopping before I bring the plants in for the winter.I started last falls cattleyas at about 4 to 6 inches below the bulbs. Meaning the tip of the tallest leaves were 4 to 6 inches below the bulbs. Both shelves set up that way. This year, I am thinking of leaving only 3 inches of clearance between the bulb and the leaf tips of the tallest catts. That does NOT mean 3 inches below the fixture, just 3 inches from the bulb. Gotta keep a closer eye on them with the T-12 bulbs. If the leaves grow enough to touch the T-12 bulb, the heat is enough to dry and scorch the leaf.

  9. #19
    stefpix is offline Senior Member
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    I saw at the home department store a T8 fixture on sale for $24. Had a decent reflector and seems bright than my cheapo T12 that have a crappy reflectir. It takes 6 bulbs but needs to be wired to a plug. Is it complicated? did you wire yours yourself?

    I think it may be a better deal than the T5 that is 2 bulbs and 2 ft long at the hydroponic store... But the T5 looks nicer. I may rather support the indy store... but are 2 T5s enough to bloom cattleyas?

    wondering wondering.
    T8 fixture 24 + 10 tubes pack $19 + wire / plug $ 10 + chains $ ? = maybe 55$

    32 W x 6= 192 W

  10. #20
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    I have the two bulb fixtures in the 4 foot length. What I have done is use two T-8 fixtures on a shelf, one at each side, hung at an angle so they are tipped to throw more light to the center of the shelf instead of straight down. I can set the slightly taller Catts down the center of the shelf between the two fixtures and some of the shorter catts in a row along the edges of the shelf.

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