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  #11  
Old 10-20-2020, 12:07 PM
Orchidtinkerer Orchidtinkerer is offline
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Originally Posted by emmajs243 View Post
I had a "growing up" moment a few months back when I was sitting in Home Depot's aisle shopping for lights and suddenly saw the average annual price cost of LEDs versus regular bulbs! Idk how I am nearly thirty and just now having this realization but normal light bulbs cost a ton per year! It's absolutely silly when comparing with LEDs! SO I swapped me entire house to LEDs and HOPEFULY I'll start saving some money!
Yes Led's use 1/12 of what incandescent lights used to use. So a 300 dollar bill could easily be 1/12 of that which is 25 dollars or 275 dollars saving per year. I saw the potential as soon as they came out but I remember in the early days my led's were badly made and did not last more than a year - that annoyed me. Wasn't long before Ikea started mass producing cheap led's and I still haven't replaced a single one of those yet.

The hydroponic stores here do not have the best Led's or the best prices yet. It is still a new market, but more and more great lights are coming out every year.

I recently discovered one with warm white and white light led's combined which is what I have read is the best to use. white light seems to encourage root growth, red or warm white seems to encourage flowering but I have not noticed a great difference, both will get orchids to flower or produce roots. I'd like to think both together has produced the best results but it is hard to say.

Full spectrum (either 6000k white or 3000k warm white or anything between) beats fluorescent lights producing nicer growth, using about half the electricity and certainly beats red+blue only led lights.

Edit: thinking about my grow spaces one with warm white + white light has made one of my up till then struggling vanda's produce the most amount of roots in my care to date but at the time I was attributing it to a slight increase I made in the lighting hours. It is very hard to pinpoint what changes we make has the biggest results. If I were to pick just between warm white and white I would lean towards the white light since that produces good roots growth and good roots = best results long term. Under warm white the orchids flower more but eventually they run out of energy and then sulk so a combo of both is best, otherwise I would recommend white led over warm white since yes we want our orchids to flower but sunshine can always help, 80% of the year our orchids won't be flowering and will need the right light to just grow.

Last edited by Orchidtinkerer; 10-20-2020 at 12:32 PM..
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  #12  
Old 10-20-2020, 04:09 PM
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Color temperature is a measurement of how artificial light appears to a human eye. It is meaningless for describing the effect on plants. Plants experience light differently than we do.

By a random accident 6000K color temperature fluorescent lights work well for growing plants; that's because the combination of elements used in the tubes to generate that light just happen to emit photons in a spectrum good for growing plants.

6000K LEDs tend to emit different wavelengths than 6000K fluorescent tubes. The 6000K number is meaningless.
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  #13  
Old 10-24-2020, 10:13 AM
thefish1337 thefish1337 is offline
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I have LEDs that are 4000k mixed with deep red diodes (a horticultural spectrum), I also have 3000k and 4000k without added red. No way to say which is better without a controlled experiment. LEDs with spectrum higher than 4K have way more blue than you ever need and are extremely harsh on the eyes IMO. Many new lights are coming out with UV, far-red, added red some of it is real some of it is untested.

Deep red 660-700 nm supposedly increases the efficiency of photosynthesis in combination with white light Emmerson Effect

far-red has variable effects depending on the plants you chose, it increases the yields of lettuces but can negatively impact the morphology in other plants without increasing yield.


None of these experimental or horticultural spectrum have been tested on orchids so be weary of extraordinary claims:
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It has been noted that there is considerable misunderstanding over the effect of light quality on plant growth. Many manufacturers claim significantly increased plant growth due to light quality (high YPF). The YPF curve indicates that orange and red photons between 600 and 630 nm can result in 20 to 30% more photosynthesis than blue or cyan photons between 400 and 540 nm. [8][9] But the YPF curve was developed from short-term measurements made on single leaves in low light. More recent longer-term studies with whole plants in higher light indicate that light quality may have a smaller effect on plant growth rate than light quantity. Blue light, while not delivering as many photons per joule, encourages leaf growth and affects other outcomes.[8][10]
Wikipedia

The single most important thing to growing your orchids well under LEDs is making sure they get enough light

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  #14  
Old 10-28-2020, 05:35 PM
marylandmike marylandmike is offline
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How many hours a day do you run the lights in winter vs summer? thanks, Mike
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  #15  
Old 01-12-2021, 10:46 AM
ElleBlyth ElleBlyth is offline
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Hello...i would like to add to your knowledge in terms to timing. that is too much lighting time. 12 hours is generally max amount, so you need to give up some time in the morning or evening. I have no idea whether an Acadian Cycle is important to coral or if it is just the total amount of light they get each day. A good compromise might be some moonlights that allow you to see what is going on, but is like night to the sea creatures.
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  #16  
Old 01-12-2021, 04:44 PM
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Lumen, Lux ..too complicated.

LED's by WATTS ... 12W = 1,000 Lumen
You want your plants min 6-7 inches under +16W (Phals) to 30W(Cattleyas)..

To get to 30W you can add 3 10w Leds for example.
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  #17  
Old 01-12-2021, 05:05 PM
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Lumen, Lux ..too complicated.

LED's by WATTS ... 12W = 1,000 Lumen
You want your plants min 6-7 inches under +16W (Phals) to 30W(Cattleyas)..

To get to 30W you can add 3 10w Leds for example.
That's far too black and white, IMO. The problem with that is that the efficiency is really dependent on the light source, and even within a light family (LED for instance), you can have a wide range of efficiencies at converting electrical power into lumens.

There are good reasons why Lux, footcandles, and PPFD are used to quantify light in relation to plants. All these are measures of the light actually hitting the plant when measured at plant level, independent of the light source characteristics (including the sun!). These are far more meaningful measures than electrical output of a unit.
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Old 01-12-2021, 06:02 PM
SADE2020 SADE2020 is offline
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That's far too black and white, IMO. The problem with that is that the efficiency is really dependent on the light source, and even within a light family (LED for instance), you can have a wide range of efficiencies at converting electrical power into lumens.

There are good reasons why Lux, footcandles, and PPFD are used to quantify light in relation to plants. All these are measures of the light actually hitting the plant when measured at plant level, independent of the light source characteristics (including the sun!). These are far more meaningful measures than electrical output of a unit.
That is true! Distance form the light sources, temperature as well, quality over quantity, you are totally right. But it is also like the Coke formula...when comes to measurement Light Intensity or by Genus and adjusting to all different needs, it is complicated. I didn't mean to sound careless.

PD: I think at the end they (our plants) are smarter than us and adjust to what we provide.

Cheers!
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Old 01-13-2021, 09:05 AM
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I think at the end they (our plants) are smarter than us and adjust to what we provide.
Yes, plants will adjust, but whether that's acceptable or not depends upon the type of grower you are - one who grows plants that "tolerate" what they are given, or one who works to provide what they need.
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Old 01-13-2021, 09:21 AM
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Yes, plants will adjust, but whether that's acceptable or not depends upon the type of grower you are - one who grows plants that "tolerate" what they are given, or one who works to provide what they need.
I completely agree with this. I fell in the former group until recently, and my plants had to deal with the natural light they were getting in the winter. My windows may all face south, but winter in the Netherlands is often cloudy, on top of the very short days. I was still thinking they were growing and blooming fine, but in the fall I finally went the 'provide what they need' route, and I have to say that I have never seen so much growth happening in the winter until this year! I'll be curious to see how they will bloom this year.
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