There are many benefits to using LED grow lights over more traditional HPS lighting. Here are some of the most common questions we receive from people who are looking to learn about LED grow lights!



How and when should I use LED Bar Lights?

Because of the low profile design and IP65 rating, KIND LED Bar Lights can be used in a number of ways, including vertical setups and in between rows of plants for lighting areas of your grow that before had gone unlit.


The KIND LED Bar Lights are split into two main spectral categories, Vegetative and Flowering. There are then two sub-categories within each of the Vegetative and Flowering lights. These are the Macro Spectrum and Micro Spectrum.

The ‘Macro’ Spectrum offers the primary spectrum needed for Vegetative or Flowering growth. The Macro Spectrum is comprised of the major blue and red bandwidths that are readily absorbed by plants and are the major building blocks for photosynthesis.

The ‘Micro’ Spectrum offers the more secondary spectrum needed for Vegetative or Flowering growth. The Micro spectrum is comprised of the bandwidths that are absorbed by the plants in lesser amounts like the oranges, greens, yellows, IR, and UV.



Flowering Bar Light

The Flowering Bar Lights are biased on the red end of the spectrum and are great for all supplemental lighting on high light use plants that are in the Flowering stage or as standalone Flowering stage lights for average light use plants. The Flowering Macro Spectrum would have the main spectrum needed for robust Flowering and the Flowering Micro Spectrum would offer the secondary spectrum needed to round out a more complete spectrum if using multiple bar lights over one area.


As a rule of thumb, if you are simply trying to add supplemental light to a greenhouse or indoor grow, you would want to lean more toward the Macro Spectrum Bar Lights.

If you are composing a multiple bar light setup and/or will be using the KIND LED Bar Lights as a primary source to light a hydroponic table or vertical setup, it is suggested that for every two Macro Spectrum Bar Lights used, one Micro Spectrum Bar Light should be added, thus a 2 to 1 ratio of Macro to Micro Spectra. This mix will give you the perfect 12-band spectrum that is found in all of our traditional LED grow lights.


The footprint of the bar lights is relative to the overall length of light used (ie. 2ft, 3ft, 4ft). At a 12” hanging height, the usable light will extend out from the edges of the bar light by 3” to 6” inches, so spacing between the lights would be 6” to 12” apart. This type of spacing would work for all primary lighting applications that deal with average light use plants such as leafy greens. If you will be using your bar lights as supplemental lighting, the spacing would be determined on several factors such as lighting density already present, position of lighting in relation to plants, and overall amount of light required by the plants.

The rugged construction makes the Kind LED Bar Lights the perfect solution for commercial greenhouse applications. Unlimited mounting options make them the ideal choice for anyone wanting to add to their existing setup or someone looking to push the limits of what’s possible in a grow space. These include….


  • Vertical wall setups

  • Stacked or racked multi-layer systems such as fodder systems

  • Free hanging lighting between plant rows

  • Outside/inside edge lighting in grow tents

  • Vertical plant lighting in trellised greenhouses for climbing plants such as cucumbers

  • Replacement fixtures for any T-5 fluorescent setup


All KIND LED Bar Lights have an IP65 (Ingress Protection Rating) that ensures the safety of using them in the harsh conditions of commercial greenhouses. An IP65 rating means that the lights are completely dust tight and can also handle the spray from a 6.3mm water nozzle from any direction with no harmful effects.



What is the recommended Bar Light hanging height?

KIND LED recommends keeping a distance of 12" between your Bar Light and the top of your canopy. At a 12” hanging height, the usable light will extend out from the edges of the bar light by 3” to 6” inches, so spacing between the lights would be 6” to 12” apart. This type of spacing would work for all primary lighting applications that deal with average light use plants such as leafy greens. If you will be using your bar lights as supplemental lighting, the spacing would be determined on several factors such as lighting density already present, position of lighting in relation to plants, and overall amount of light required by the plants.



How close should my light be to the top of my plant canopy (K5 Series & K3 Series)?


Due to the massive amount of light that Kind LED lights emit, the recommended hanging height above your plants is 30"-36” for the K5 Series and 18"- 26" for the K3 Series. Some high light use strains will be able to tolerate closer hanging heights, but we recommended that the light not be set closer than 24” for the K5 Series and 14" for the K3 Series.



Can I transfer plants from HPS or Fluorescents straight to my new Kind LED?


You most certainly can, but due to the fact that LED lights put out a very different type of light, it will take a few days for your plants to adjust to the new light. During the first few days, you may experience some bleaching on the uppermost leaves of your plant. This can be minimized by hanging the light 48” away from your plants for the first 3-7 days until they are used to the new light.



How can I find my light’s sweet spot in terms of hanging height above the canopy?


We suggest starting with the light at 48” for the first 3-7 days. After this initial break-in period, the light can be lowered down, 6” at a time, until you reach 30”. If any discoloration or twisting happens on the leaves, raise the light back up 6”. This should be the height you maintain through the plant’s life cycle.



Some of the new leaves on my plant seem to be twisting or appear to be bleached. What’s going on?


This can be caused by your light being too close to the plants. Try moving the light up about 6”-12”. You should see these signs disappear within a few days and normal healthy growth begin again.



Why does the footprint of my light not look as big as the advertised footprint on your website?


Our advertised footprints are achieved only when the light is hung from our recommended hanging heights. The closer the light is to the canopy, the smaller the footprint will be. Our stated footprint sizes are for average light use plants. If growing high light use plants, the effective footprint will be slightly smaller.



Can your lights run on 240v?


Yes! Kind LED lights can run safely on voltages ranging from 110v all the way up to 277v. The cord will need to be changed out to accommodate the different voltages, but this will be all you need!



In a world of purple, should I be wearing protective glasses?


We always recommend that people use protective eyewear in any indoor gardening room. HPS, MH, and LED all emit huge amounts of light, and just like the sun, can be hard on your eyes. We here at Kind LED suggest a protective and color corrective pair of shades like the ones created by our friends over at Method 7. They have LED specific models that can be purchased directly from a Kind LED representative.



I’ve heard LEDs require slightly higher room temps, is this true?


Yes, due to the fact that LEDs have much less radiant heat coming from the light, the surface temperatures on leaves under LED lights can be 10-15 degrees cooler than compared to HPS. This can cause transpiration rates and metabolic processes in the leaf to slow down. Raising ambient room temperatures up to 82-85 degrees will allow the plant to thrive in a perfect environment.



Can I still use CO2 in my room with my Kind LED?


Absolutely! One of the greatest benefits of higher room temps when growing with LEDs is that the plant's ability to assimilate CO2 greatly increases when temps are raised to 82-85 degrees. In fact, it is widely believed to be the ideal temperature for this process to take place, meaning your plants are fully utilizing that tank of gas that was such a pain in the butt to drag into your grow room.



After a power outage, does my light come back on or stay off?


This is a user preference. The light has an internal memory that will revert the light to its last manually saved setting. If you prefer the light to come back on at a certain intensity after a power outage has occurred, manually adjust your light to reflect this intensity using the A, B and C buttons. Once the light is at the desired intensity, press the “OK” button twice. After this is done, simulate a hard power off or power outage by unplugging your light and plugging it back in. You will now notice that when your light powers up it is the same intensity as you last manually entered.



Why aren’t my spectrum settings staying set?


The “OK” button must be pressed in order to save all manually entered settings. When setting your spectrums to a desired percentage, the “OK” button must be pressed to lock the setting into the light's memory.



Why aren’t my timers staying set?


The “OK” button must be pressed in order to save all manually entered settings. Make sure that when you are setting up your timers to press OK after each new setting is entered. The complete process is as follows: Turn timer on. Press “OK” to save setting. Select the desired time (military time). Press “OK” to save setting. Select your desired intensity for Channel A. Press “OK” to save setting. Select your desired intensity for Channel B. Press “OK” to save setting. Select your desired intensity for Channel C. Press “OK” to save setting. Makes sense, yea?



I pressed the auto run button why isn’t my light doing anything?


If you press the “Mode” button in the middle of the auto run cycle (any time after 4pm or 1600hrs) you will have to wait until the next scheduled time setting for your light to adjust automatically. If you do not want to wait for your next scheduled timer, exit auto run by pressing “Mode,” manually adjust your light to reflect the desired intensity and put your light back into auto run by pressing “Mode.” This will kick start your light into the auto run mode, and it will run its cycle from here on out. 



What does the Heart Shaped Kindness button do?


The heart shaped button used to be a way to reset your light to the factory default settings. Since this button is pretty centrally located on the remote, you can see how it is easy to press this button when setting a timer or viewing the temperature. We had several calls from Kind customers such as yourself who had accidentally reset their lights to factory settings after all timers were programmed. So, to reduce the headache, we removed the function of the heart button.



Will the red light emitted from the display have a negative impact on my grow?


No. The small amount of light from the display will not affect photoperiodic plants. Kind LED Grow Lights have been tested and used for years, and there are countless satisfied growers who have sung praises of their Kind lights and the unparalleled results in quality and yield that they achieved. The very small amount of indirect light that is produced is quite a bit less than would be produced by a night sky with even partial moonlight.



Are there video instructions for setting up the timers?


Yes! Prior to setting your light’s timers, it is helpful to watch our instructional video on our YouTube channel, Kind LED Grow Lights:



The video will walk you through the functions of the remote and how to program your light to have a sunrise/sunset effect using the internal timers.



Will the fans on my light continue to run when there is no light emitted and all channels are set to 000 intensity?


Yes, the fans will continue to run so long as the power button is turned to the "on" position. The fans continue to run to ensure the electronic components in the light are protected from harmful moisture. When your lights turn off for the dark cycle and the temps in your room drop, the cooler air has less ability to hold moisture and condensation forms on nearly everything in the room. The fans help to expel this condensation, rather than allowing it to settle on the components inside your light.


My hydro system is all tied into the same timers, so can I use an external timer with my light?

Yes! You can use the lights with an external timer. You will just need to set your light's intensities to the desired levels and save them by pressing “OK” on the remote. This will ensure the same settings are restored when the light turns back on via the external timer.

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