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Thread: LED grow lights strong enough?

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    WolframOmega's Avatar
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    LED grow lights strong enough?

    Hi all,
    I've been considering using LED lights. Are these strong enough for cps like Drosera, Nepenthes, and Heliamphora?

    http://www.ebay.com/itm/380792689599...%3AMEBIDX%3AIT

    http://www.ebay.com/itm/HQRP-Blue-Wh...item3f20575e48

    Thanks,
    WolframOmega

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    Jake Tower's Avatar
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    I use leds, not something like this small. But 1515 lux's dont seem bright enough, Id say no. Mine uses about 300 watts, (true watts) if that puts in in prospective of how powerful mine is. Its just so hard to say unless you give it a try, because leds technology still needs so much research on plant its hard to really tell unless you actually try it.
    Tower//Jake
    "Last night I lay in bed looking up at the stars in the sky and I thought to myself, where the heck is the ceiling."
    http://www.thecpforum.com <--- My site

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    A measurement of lux for a blue/red LED fixture is completely useless. Lux/lumens are a measurement of light perceived by the human eye and not the actual useful light to the plant.

    Wattage is also not a good indicator of how good/bad lighting is just how much power the fixture is using. I have a heli under 4 LEDs running about 5W in a 7" W X 13" H X 12" D space that is nice and red.

    Since I have never used any LED light panels and ALL the premade ones I've seen in person are just bad, I can not comment on them. If you have any DIY skills I'd look into making your own. There are a good amount of threads in the last year on DIY LEDs.

    Something to keep in mind...if you are growing plants under red/blue lighting it is VERY hard to tell the condition of your plant without a flashlight

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    Jake Tower's Avatar
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    This is the premade I use http://www.amazon.com/Extreme-189X-P.../dp/B007CKC18K

    It is far from bad, but It produced so much lighting for me, I had to turn down the light intensity. All my neps got a very dark red to them, esppecially on my eddie and hamata.
    Tower//Jake
    "Last night I lay in bed looking up at the stars in the sky and I thought to myself, where the heck is the ceiling."
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    Millipede's Avatar
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    a good LED driver by itself is 30 dollars... so 30 dollars for 225 leds, plus driver, plus fixture... I doubt that those lights are going to be anything like theyre saying

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    That is great advice RSS, I agree. DIY systems also have room for adjustments which can come in handy.
    Short cinematic documentaries on current science- moderndaydocs.com

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    Is 11,050lumens a good enough strenght for neps?

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    wolfram, don't waste your money (and energy) on these. I have one which uses similar technology (mine is in a linear form). They use old style DIP LEDs, whose efficiency is very low. Here is a bit of easy-to-read info:
    http://www.hitlights.com/blog/compar...s-cob-vs-mcob/

    This page says 35-80lumen/W for DIP (I assume for white LEDs). That is lower than T8 florescent bulbs. Lumen is not a good measure for red/blue type LEDs as RSS pointed out. But white LEDs are basically blue LED + phosphors. So if the white LEDs are inefficient, it's likely the monochromatic LEDs of similar technology is inefficient. DIP LEDs can't manage the heat issues easily, so this is a part of the reason for the inefficiency.

    You can squeeze out 140-150lm/W from modern white LEDs (driven soft) in comparison.

    Hyperikon hybrid T8 LED seems to have a promising spec (2200 lumen per 18W, which is 122 lm/W). If you can't do DIY and If you can't initially afford the efficient fixtures, this might be a good fit. It can be used with T8 ballast, but it is better to modify the wiring to remove the ballast (for better efficiency).

    If you can make a group buy (direct from China), I recently found a highly efficient T8 LEDs (Sunritek, which can be found in Alibaba). They were tested to have 140-150lm/W and near the top efficiency. I was skeptical at first (most of the Chinese ones I tested were pretty disappointing), but after they told me about their design, it is possible. They are driving Epistar 2830 at very soft driving current (35mA). I should be receiving these next week (and I'll see how it works agains my other DIY LEDs). Their older model was tested here and it has the top efficiency:

    http://apps1.eere.energy.gov/buildin...er_21-3_t8.pdf

    The reason I said "group buy" is that you need to order 20 or more to make the shipping cost reasonable. For example, I got 20 x $10, and shipping is about $100, so it became about $15 per bulb. Not a bad price for 150lm/W.

    House-hold LED bulbs can be used, but their efficiency isn't so high yet. Nanoleaf has one of the highest efficiency among A-type bulbs, but it is quite costly at first.
    Last edited by naoki; 07-31-2015 at 11:38 PM.

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