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Thread: How many watts for a seedling?

  1. #11

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    I realize this is an old thread but as it was bumped up I figured I'd add my two cents.

    We did a rather comprehensive tests with LED bulb, CFL lamps, T5s, Ikea grow light bulb, and we found out that 18W CFL at 6" (15cm) only delivers 30 PPFD.
    As George said, it's the PPFD that's important, not the consumed watts. I would, however, start off a little bit lower than 200-400 PPFD to begin with. I would say somewhere around 100-200 is good, then increase the PPFD (decrease the distance) as the plants mature.

    If anyone else is considering general bulbs, I suggest you take a look at our PPFD tests for common household bulbs:
    1. Pt 1 PPFD test of LED & CFL bulbs
    2. Pt 2 PPFD test of LED bulbs, T5, Ikea grow bulb

    Or as videos:
    Pt 1 (low quality):


    Pt 2:


    Hope this helps anyone considering household bulbs as grow lights.

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    Farmer Geddon (06-03-21), GEORGE (05-03-21)

  3. #12

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    Quote Originally Posted by cacticat View Post
    First grow! I’m on day 4 now since sprouting.

    I’ve been using a 23w cfl whilst I’m setting up my grow space which will have LED lighting.

    The plant now has two true leaves and it’s working on the next set.

    My question is, do I introduce another 23w cfl?

    How many watts for a seedling?


    Thanks!
    I start mine under 600w of juicy metal halide

    Sent from my SM-G981B using Tapatalk

    "A word to the wise isn't necessary -- it's the stupid ones that need the advice."

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    Farmer Geddon (06-03-21), GEORGE (05-03-21)

  5. #13

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    Whatever light I'm going to flower with, that's what seedlings get from the start.

  6. The Following 2 Users Say Thank You to Farmer Geddon For This Useful Post:

    GEORGE (06-03-21), Loki (08-03-21)

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