Do LED grow lights put off heat?
Yes, every light produces heat. It does not matter if the light comes from a bulb, diode, or a star like our sun; they all produce heat. LEDs provide a more efficient means for converting energy to light than other methods and therefore produce less heat, but they can not break the laws of physics. Physics dictates that anything that consumes electrical power will emit heat; claims that LED lights don’t produce heat are entirely false– just ask any physics teacher.
What are differences between traditional lighting technology and LEDs:
- HID lights (metal halide, high pressure sodium and ceramic metal halide) require heat to produce light by arcing electricity through selected gasses, making them extremely hot, to the point the gasses glow. This means HID bulbs themselves are extremely hot– hot enough to start a fire, and many gardens have gone up in flames because of this danger. LEDs’ electroluminescence technology is entirely different and does not require heat to produce light; LEDs themselves will not get hot enough to start a fire.
- Much of the energy used by HID lights is emitted as infrared light (above 800 nanometers). This “light” is not usable by plants and only works as a “heater”, warming up the plants — and everything else under the light. This is why HID light feels warm on your skin, while LED light does not. Our LED grow lights don’t waste energy creating unusable and detrimental infrared light; all the energy goes toward growing your plants.
- Because LEDs aren’t wasting energy producing light plants can’t use, we can use less energy overall to get the same (or better!) growth from plants. Less energy consumed means less heat; for a given growing area, LED lights will put off less heat than any equivalent artificial light.
What is beam angle and why is it important?
It’s easy to be confused by the idea of beam angle and how it can affect plant growth. Each individual diode (LED stands for Light-Emitting Diode) has a cone-shaped lens that can be designed to focus the light coming from the emitter anywhere from 30° to 180°. In LEDs, beam angle refers to this angle of the light cone the primary lens creates. It is important because it determines the intensity of light reaching the plant as well as the total effective footprint of the light.
HID (MH / HPS) bulbs have a 360° beam angle- half the light produced is aimed up and away from your plants, which is why a reflector is needed to try and reflect as much of this light as possible back down to your garden. LEDs in general are more efficient at growing plants than HIDs because LEDs only produce light aiming toward your plants. Properly-designed LED lights that use an optimal beam angle in the primary lens have no need for a reflector.
Each diode in every Easy LED grow light uses a 120° lens, which is the best angle to achieve a large footprint with intense light covering all of the growing area. Many other companies sacrifice the footprint in order to achieve better canopy penetration by using a 60° or 90° lens, or even use secondary lenses to further focus the light into a narrow cone; this is often the only option with weaker LEDs. Easy LED’s Universal Series of lights use only the most powerful 5-watt chips, so we can use a more oblique angle to create a generous, evenly-covered footprint while still maintaining superior canopy penetration.
Watt-for-watt, our lights have the largest, brightest, most evenly-covered footprint of any LED grow light on the market so you can grow healthier, high-quality plants everywhere in the footprint. We maximize your yield rather than just the reading from your PAR meter directly under the light!
What are lumens, and are they useful for evaluating grow lights?
Lumens are a measure of luminous flux, or the total amount of visible light radiating from a source, weighted by the human eye’s sensitivity to the particular wavelength of the light. Lumens are the best measurement to use when evaluating how well a light will illuminate an area for human eyes. The human eye is most sensitive to light in the yellow range of the spectrum, so 100 photons of yellow light have a higher lumen rating than 100 photons of blue light or 100 photons of red light.
Plants preferentially absorb red and blue light. Lumens preferentially weight yellow light and de-weight red and blue light, making lumens just about the worst light intensity measurement possible for evaluating how well a light will grow plants.
Lumens’ measurement of human-visible luminous flux differs from PAR, which measures radiant flux — the total number of photons in the visible spectrum without weighting for human visibility. Yield Photon Flux (YPF) is like lumens in that photons are weighted based on their wavelength, but YPF weights them based on their usefulness to a plant rather than to the human eye, and YPF considers photons outside of the human visual range. For this reason, YPF is the best measSaveurement of light intensity for growing plants, although it still has significant drawbacks as we explain here.
What is YPF, and is it good for comparing grow lights?
Yield Photon Flux (YPF) is a measure of light intensity, weighted based on the light’s usefulness to plants. Unlike PAR, which considers only photons in the 400-700nm visible light spectrum and weights each photon equally, YPF considers photons from 360-760nm (ultraviolet through near-infrared) and weights each photon based on the plant’s photosynthetic response to the particular wavelength of light.
The weighting employed by YPF measurements eliminates some of the shortcomings associated with PAR measurements. For example, 100 photons of pure-green light have the same PAR value as 100 photons of red light, even though most of the green photons will be reflected by the plant while most of the red photons will be absorbed. YPF accounts for this and 100 photons of green light have a lower YPF than 100 photons of red light.
Unfortunately, YPF still has shortcomings when used as a measure of how well a particular light will grow plants. YPF does not account for the fact that different wavelengths of light are used by plants to initiate different biochemical reactions and that a wide spectrum is necessary to grow plants to their maximum potential. All-red light will have a higher YPF score than a broader spectrum containing all the wavelengths of light plants require for photomorphogenesis (creation of secondary metabolites such as pigmentation, flavonoids, THC and CBD).
Like PAR, YPF is also measured at a single point, which does not indicate how well plants will grow over the entire footprint of an artificial light source. If light is being focused into a narrow beam by secondary lenses, the YPF score in the center will increase, even though plants can only be grown directly under the light. The inverse square law of light means that YPF measurements will decrease by the square of the distance from the source– so if a YPF measurement is 100 at 1 inch from the fixture, it will be 25 at 2 inches, and 11.1 at 3 inches. As with PAR, it’s easy to claim a high YPF reading for a light fixture if the measurement is taken close to and directly below it.
YPF is a better measurement of how useful light is to plants than PAR, but still shares most of the shortcomings of PAR. A red laser pointer has an amazingly high YPF score but can’t be used to grow plants.
Only by considering multiple YPF measurements taken over the entire footprint of the light, at the recommended hanging distance above the plants, and considering the entire spectrum, can useful comparisons be made between grow lights.
What are the vegetative and flowering footprints based on?
Our vegetative and flowering footprints are based on the light intensity requirements for some of the most commonly-grown high-light plants such as tomatoes, peppers and Cannabis.
There are hundreds of thousands of species of plants, covering a huge range of light intensity and duration requirements. We simply cannot provide recommendations for every kind of plant, so we had to base our recommended footprint sizes on the plants most commonly grown under artificial light.
For plants requiring less light intensity, such as lettuce, the footprint coverage can be larger than what we recommend. Plants requiring more light intensity such as most Cacti would require a smaller lighting footprint to get enough light.
To make the footprint larger, you just need to hang the light higher over the plants, and to make it smaller, move it closer to the plants.
Do LED lights cause magnesium deficiency?
No, LED lights do not cause any kind of nutrient deficiency.
A rumor was started that LED lights cause magnesium deficiency when people noticed that some plants develop purple petioles (leaf stalks) or streaks on the stems under LED lights, but not under HPS lights. While purple coloration on stems and petioles can be one of the signs of magnesium deficiency, it is also a sign that the plant is producing natural purple pigments (anthocyanin) in response to ultraviolet (UV) light. Many artificial lights (including HPS and most LEDs) don’t give off UV light, so plants grown under these lights don’t produce this natural pigmentation. Under these UV-lacking lights, purple coloration is often a sign of magnesium deficiency. However, when grown under UV-containing Easy LED lights or natural sunlight, plants will produce their full range of natural pigmentation– it is not necessarily a sign of a nutrient deficiency.
The major symptom of magnesium deficiency is usually yellowing, blotchy-looking (chlorotic) leaves, accompanied by purple stems and petioles. When growing under Easy LED grow lights, unless the leaves are chlorotic, purple stems and petioles are not a sign of a magnesium deficiency– they are a sign of a happy, healthy plant.
Do your Led lamps work in cold environments?
Our products absolutely can work in cold environments. Easy LED luminaires are the perfect solution for a broad range of industrial applications, including cold storage, freezer and cold food processing. While fluorescent and other technologies can be adversely affected by cold temperatures, this is not an issue with LED lights. LEDs love the cold.
Why do plants need horticulture LED lights?
mostly use red light and blue light for proper vegetative growth and flowering. And humans who need to see the plants appreciate a little light in the green part of the spectrum, which is where we see best. So the best LED grow lights are those that combine, in the proper proportions, light from these three parts of the spectrum. With LEDs, we are able o provide only the usable spectra and wavelengths without wasting energy on those that are not beneficial to plants.
How do LED helps environment?
LED technology offers many environmental benefits. The production and use of LEDs requires significantly less energy than incandescents or CFLs. With Easy LED Lighting products, there are no lamps to throw away and the entire fixture is recyclable with no mercury content to worry about. All Easy LED Lighting products are free of mercury and other toxic materials, a clear win for the environment.
How is LED lighting technology changing greenhouse lighting?
LED lights are much more energy-efficient than most other forms of lighting, so growers’ energy bills are greatly reduced. LED grow lights don’t generate as much heat as legacy lighting types and so external cooling systems are unnecessary. LEDs offer scientifically tuned spectra for different plant growth and different stages of growth.
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