TheStarkEdelics Channel at the time, I was trying to help people understand that wattage has nothing to do with intensity or useable photosynthetic light. Lumens is measured in the green part of the spectrum. The part that human eyes are most sensitive to. Lumens can give you an idea of intensity but it doesn’t say much about the overall PAR which covers the most usable part of the visible spectrum that human eyes are less sensitive to. Plants utilize mostly wavelengths outside of the green zone and the only way to measure that is with a quantum sensor, not a lumen meter. So if one was to buy a red/blue dominant grow light and use a lumen meter, the lumen level would be low, but the par readout would tell another story. Mainly, if trying to figure out the appropriate distance your light needs to be from the plant canopy, a lumen meter won’t be appropriate. If it’s white light and one is familiar with a their lumen meter, it can be used to a extent so long as they figured it out with trial and error. But if it’s not a white light source, it would be very difficult to use a lumen meter reliably. The only meter that is consistent and proven is a quantum par sensor. So do not buy a grow light based off lumens. If it’s led and it’s unidirectional light, then wattage would be a more reliable way to purchase so long as you’ve established a baseline of what can be grown per actual watt. But you can’t intermix that measure. 50 watts of fluorescent isn’t going to be the same as 50 watts of led. And certainly 50 watts of incandescent doesn’t even compare. basically the less radiated infrared heat output by a light source with the same wattage compared to another light source, means in general, more usable photosynthetic light per watt. that’s the basis of describing efficiency and lumens plays a part in that understanding, but lumens alone is not measuring light for growing plants in a way that is reliable or complete.

Growing Answers so helpful thank you so much!!

Don't ever think it. If your growing non cannabis grows just grab a 300 watt led... If growing cannabis grab something that switches from more blue for veg an more red for flower.. and a higher watt if growing cannabis..

Do you use Wechat or SKype? Maybe I can help you. My WeChat/whatsapp/Skype: +86 18129800313

@@hobertzheng what brand you use

korieadell thanks!

yeah leave the guy alone I've learnt stacks

Vadim Melnicuk hey I have a led full spectrum light and a CFL is that bad

Kilmichael talk to me first. I dedign led white spectrum lighting. I was the first.

Does red and blue lights work better then white light's

I have a few led videos if intrested

You might find that info on certain light manufacturer websites, but exactly how it's done, I have no info on that. Google that instead of looking for KZfaq videos cuz I'm pretty sure there are none. It holds little value to the general viewer except interest and only high tech green houses would be doing it. If any video is done, it likely would be from a journalist or reporter doing segments on those places and led tech.

bro?

kzfaq.info/get/bejne/fsenmrNmuL60m6M.html

Dude. Lmao

at least let me know what the optimum distance from the white led is. i know the red/blue is 12 to 24 inches depending on the wattage, but i don't know about the white leds.

+xephorce part 2 is coming soon. The experiment is almost done. In my opinion, 12 inches works fine. I haven't noticed any issues being closer either. At least for a short time.

ok thanks i am worried about light burn from white leds being to close.

About 5 inches from the white led will work, but 12 inches is fine for veg stuff.

kzfaq.info/get/bejne/fsenmrNmuL60m6M.html

Sophie Mo you don't need to worry about your eyes. Just wear sunglasses if you feel the need. Also if it's in a large room and not a closet, heat shouldn't be an issue. With any plant growing, air exchange and ventilation is mildly important. Airflow prevents things from settling on leaves and air exchange keeps co2 levels from declining if the plants are in a small non-ventilated space. It also keeps humidity from rising and causing molds or fungus.

Hello Random Ryan, thank you so much for your reply, just to be clear (my English is not good good) I am living in the basement...

Shaz Soo watch the other links in the description. You may want to reconsider.

That’s passion right there

Phaik Youser you can just use a house led flood light

Hey man. Led strips 4 ft long in day light white are 13$ and some change at rural king. They are bright as shit. Full spectrum. I started with 4 and gotta wear shades when I’m doing things.

Kentilor kzfaq.info/get/bejne/rNOkqsp7zK7YfGQ.html

Jake Allen it’s likely not intense enough unless it lettuce and small herbs you want to grow

Geoffrey Terry aquarium lights use this technique by mixing various color temperature of whites, but the results would not be dramatically different for plants. 3500k is all you really need for general growth.

Julius Steele get a 300 watt for flowering it worked wonders for me a few years back

Audio-Technica ATR3350

Any light works for aquatic plants. They are not special.

White Elephant 😂😂😂😂😂😂 me rn

e27 led bulbs are amazing ive seen lot of grows and great yield. DIY bulb panel.

😂 my sister caught my nephew trying 2 grow a plant in his closet with a regular light bulb.... I told her leave it there & don't say a word.. The work he tries to put in with 0 result will be punishment enough

Thanks! Grow test is still underway. So far it's inconclusive, but going well.

No games Yes life blue/green color tinted sunglasses

probably more than enough

@@GrowingAnswers thank you.. 🙏

+sodaman2006 If you mean without passing through the earths atmosphere the suns spectrum looks like this sciencequestionswithsurprisinganswers.org/images/sunlight_wavelength.png

+Simple Logic Thanks for the post. I found that going through the atmosphere it is reduced. If it wasn't for that fact we would'nt be able to grow anything outside. www.calpoly.edu/~rfield/Thermalstructure_files/image002.gif

sodaman2006 Yes, afaik the overall intensity is reduced along with alot of the black light, aswell as most of the UV, and some of the IR. Leaving us with a spectrum that looks like this www.fondriest.com/environmental-measurements/wp-content/uploads/2014/03/par_solar-radiation.jpg But the spectrum on earth changes with where on earth you measure it, and at what time of year, and what time of day. Generally those changes are measured in Kelvin www.d.umn.edu/~mharvey/tempbar.jpg

sodaman2006 The sun does funny things too like bursts of far red right before sundown. It has shown to shorten the flowering cycle.

sodaman2006 The sun does funny things too like bursts of far red right before sundown. It has shown to shorten the flowering cycle.

Shouldn't be too much longer. No spoilers, but I'm a bit surprised so far.

+OrionA51 goddamn it, you've given me no choice but to subscribe

kzfaq.info/get/bejne/iNuYnKmWmL3HgWQ.html Part 2 is linked in this video description also

Lol, I probably should have noted that. I have no idea.

...lol !!!!!

That light is actually 6000k. It's fine for vegging. You need a certain ratio of red to blue to flower/fruit. You don't need 2 different lights for the growth process. You can use one or a set of 3000-3500k lights or even 4000k to have that ratio. However, the grow test is to provide more info than just a simple yes or no answer. Switching lights is usually done to try to squeeze the most out of what you are growing. It's not required.

I must be overthinking this; can you summarize, I've watched all 3 vids thus far. The white light that you're testing is 6000k, which showed better results (via vid 2). But in the post above you stated "you don't need 2 lights for growth process, you need 6500k AND 2700K"; isn't that 2 lights? Or more simply are you saying that this one 6000k 50watt light supplies all of it and can do both veg and flower with it? My mind is spinning from reading and watching too many contradicting studies, but your video 2 results seem the clearest to me, so thanks for that!

Sarah Longenecker well the light demonstrated in part 1 is 6000k. The light used in part 2 is 3000k. 6000k is great for veg. 3000-3500k can be used for the whole process. The only reason you would use a light for veg and a light for flower is to get a plant larger during veg and keep it growing more leaves without triggering flowering. Depends on if a plant has a photoperiod though. Switching lights during phases is an attempt to get the best you can get or simply put, to control growth.

Ah, I completely missed that it was a different light; thanks for clearing that up! I looked on amazon for this light and I can only find the 6000k, do you have a link to the 3000k? Have you done a growth compare between 6000k white vs 3000k white? When is video 4 coming out, can't wait? Any experience with this light, www.amazon.com/gp/product/B01HI3AFYM/ref=crt_ewc_title_dp_6?ie=UTF8&psc=1&smid=A2L94QV6P0R9ON ? Thank You!

Sarah Longenecker that light seems great for the price. It should easily outperform 2 of the same 3000k light I used . It's actually draw is 124 watts, not 300. Part 4 should be out in the next few weeks. Some people might say those brands of lights are crap, but for the price, it's perfect for a general hobbyist. Heck, the pink light I used in the video was $70. Also there really is no real good reason to compare a 3000k to a 6000k. lights that favor the blue spectrum are good for plants that are leafy greens, but you can use both for veg. You wouldn't use a 6000k for flower or fruiting though. It would suppress the production of auxin and reduce the amount of flowering. However, a 3000k won't hinder the veg state, it more or less just allows the plant to put some energy into flowers intend of all of it into leaves. While the sun changes its shades over the season depending how much atmosphere it's filtered through, we don't change the sun to manipulate plants. Many plants will produce during peak summer while the sun is 4000-5000k. However, the color temperature changes during sunrise and sunset and through the day during its transition to and from its peak. At no time is the sun just blue though, so using 6000k or higher really is just to suppress flowering. Otherwise outside it would just flower if it doesn't have a photoperiod.

Joshua Turner what other type of white led is there that doesn’t use a yellow phosphor to make it white?

Some LEDs are starting to use red and sometimes green phosphors to create fuller spectrum and higher color rendering. Here is a forum thread describing a COB chip that I designed using red and green phosphor for growing plants in planted aquariums/vivariums. www.dendroboard.com/forum/parts-construction/328713-first-perfect-sunlight-mimicking-95cri-vivarium-led.html

@@northeastslingshot1664 I would like to learn more about your knowledge of LEDs are you willing to share with a humble grower such as myself?

kzfaq.info/get/bejne/fsenmrNmuL60m6M.html

You’ll get flowers under MH, but just less yield

@@GrowingAnswers what if I supplement warm light, in equivalent amounts with led's? sounds janky but it's all I have. Since it's winter I don't have too much problems with heat created by bulbs/ballasts etc , but come summer I will have to use only LEDs.

Rodney Daub any additional red light will help

ceaserelizondo I don’t think just 2 ho T5 is enough for chilly’s. 4 is more like it. Could use 2 for young veg

@@GrowingAnswers thank you so much

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