White LED vs Red Blue White LED Grow Test w/Time Lapse – Lettuce Ep.1


No Aeration vs Aeration –
MaxBloom X4 LED Grow light Review- (Live 8/26/18)
Episode 2 (Soybean) –
Ep.3 (Final Results) –

The white LED brand is Roleadro. It is 115 watts at the wall. The Blurple light is 130 watts at the wall and is generic brand. Info for these lights can be found in the links below.

I used the nutrient trio from General Hydroponics. I started off with a seedling dose and then jumped to the aggressive vegetative dose after the plants had their first few sets of true leaves. I started the test off with 6 gallons of water in the container and ended with a little over 3 gallons. The entire grow was over a period of almost exactly 1 month in a consistent ambient temperature of 68F.

The PAR output was kept under 300um of light at the plant canopy with a short period of slightly over 400um in the highest spots, but was adjusted quickly. This is when the minor tip burn occurred. The PAR output on the lights was almost identical and the center PAR measurements are 1000um/6″ – 400um/12″ – 200um/18″ on both lights. The type of lettuce was “Black Seeded Simpson” from Burpee.

The time lapse camera used was a Brinno TLC 200 Pro with the kit lens. 1 photo every ten minutes. The night cycle was removed in post and the remaining clips were sped up in post by roughly 200%. If you look closely you can see most of the growth actually happens at night. The lighting hours were 17 on.

Nutrients –
White Light –
Blurple Light –

Intro video to this series –
Blurple Light –
White LED –

For some interesting growing tips and tricks, try this link

Nguồn: https://freecode.com.vn

Xem thêm bài viết khác: https://freecode.com.vn/phan-mem


  1. Considering you grew lettuce which does NOT flower or produce fruit… its perfectly logical that it DOESNT need red light which is important for flowering and "fruiting"and not vegetation and most full spectrum leds have 60-70% of red led diodes… Just saying.. You should do some fruit grow actually … If you did send a link

  2. Idk if anyone has said this before (this is an older video) but according to Theodor W. Engelmann's alga experiments in 1883, the absorption spectra was best in chlorophyll a, b and carotenoids within the wavelength 400-500 nm. The action spectrum is the best around wavelengths 400-500 nm, and about 650-700 nm. Interesting how different plants can still grow beautifully in different wavelengths.

    Engelmann's Experiment Credit: Chapter 8, page 167 of Biology In Focus by Urry, Cain, Wasserman, Minorsky and Reece

  3. I want to grow herbs first then move up later. Sounds like I need some white LED lights. Which brand? Color? 6500K? lumens? etc…

  4. What do you suggest between 2700 to 5000k which is best?
    So these specialized grow lights are a marketing scam, ur household LED works better generally… thanks made me save $

  5. Been watching to much hannibal buress?
    "You gotta eat the lettuces, right, just straight up eat the lettuce"

  6. I just purchased some 6400K CFL grow lights. I saw a difference in my seedlings overnight compared to 5000K.


    I wonder what results would occur using both white 6400K CFL lights AND Red/Blue/white LEDs. Maybe even an experiment using CFLs for growth then switching to Red/Blue/white LEDs for flowering/fruiting at the proper stage of maturity.
    GREAT experiments, and very informative results. I hope you will continue!

  7. I know in live corals the color you see is an algae that grows within the tissue. And that color can be manipulated over different lighting, and if it gets too hot the coral will bleach out. Do plants work the same way for leaf pigments?

  8. 1:45 eh uhm again you're saying that 3000 and 4000 is white light… are you number blind?

    Anything between 5500 – 6500 Kelvin is white, 6500 being cold white blue and 5500 being warm white.

  9. IMO: The red/blue color gives the lettuce enough light(just right spectrum they needed) so no need for them to grow their leaves more widely. On the other side, with the white light, the lettuce needs wider leaf to absorb more light they needed. Just like when you give them enough sunlight and not giving them enough sunlight.

  10. hey. you gained my follow 👍 simply just because there was no fuck arounds. you keept it informativ and compact Plus thought of the Taste as well . Nice! i be back

  11. I am really interested in knowing the UV-C rating of these led lamps. Can they be used for sanitizing?

  12. That model of LED grow lights are the worst.. I remember when people here started buying them and none got good results. COBs are a different beast, they do work very well.

  13. Thanks!
    Much appreciated!!
    Great lapse!
    Solves my problem. I need to bump up my wattage.

  14. What is the variety of lettuce you are growing here? And what nutrienta, and schedule of nutrients are you using? I've had multiple attempts at the kratky method in jars and haven't had any success what so ever… What is the water level according to the net cups?


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