April 19, 2018 54 Comments

Light is a good thing for plants.  We all learned that pretty early on in our lives and the point is constantly and consistently driven home by lighting manufacturers in the indoor gardening industry. With all the competition by manufacturers to bring growers the strongest, most penetrating light, gardeners often fall in love with idea of buying more light than they need.   But did you know that thereis such a thing as too much light? Most gardeners would be surprised at how much development slows down as the plant begins to become strained with an overabundance of intense lighting.  Often times if gardeners would just raise their grow lights, they would see the difference for themselves.


The Symptoms of Too Much Light

So, how do you know if your plants are experiencing too much light?  We’ve put together a list of 4 symptoms:

1.  Folding and Hiding.

Usually seen when transplant young, tender plants outside or placed under an intense light too soon, the sudden change in light volume can be enough to cause plants to attempt to fold over themselves in an effort to provide themselves shade. This is somewhat physically similar to an under watered plant.

2.  Stunted Development.

Especially telling in fruiting or flowering plants, the upper most growth will be unable to cope with the overabundance of light and begin slowing or even halting growth as a result.

3.  Bleaching or Whitening of the Plant Tissue.

Especially common on the growth nearest the top of the plant, this will generally happen when your light is so intense that it begins to evaporate the chlorophyll out of your plants tissue.

4.  Physical Burning.

This is a rare occurrence and typically involves either direct contact with orextremely close proximity to the lamp itself. Under the wrong circumstances, the heat from a light may be enough to completely dehydrate the tissue irreparably damaging the affected area. This is not only bad for your plant, it’s dangerous!


What To Do

Now that we’ve figured out whether or not our plants are experiencing too much love in the form of light, let’s look at how to resolve the problem or prevent it from ever happening in the future.  Before we go out and buy a brand new light from your local hydroponics store, let’s first try and adjust the distance of our light to the plant’s canopy. We’ve put together the following diagram to help you better visualize where that sweet spot may be.  As you can see, your grow light is putting out 3 important levels of intensity.

Grow Light distance and Placement Diagram


THE UGLY.

The space with the hottest, brightest area of light directly underneath your reflector. If your plants are consistently reaching this point you should consider raising your reflector, managing your crop height or looking at a lower wattage alternative if these options aren’t available to you.

 

THE GOOD.

This is the optimal amount of light.  Not too intense or hot, still very strong and direct with a good amount of horizontal coverage and vertical penetration. This is the sweet spot.

 

THE BAD.

This is light that is only barely usable to your plants. The intensity is too low to provide more than the bare essentials for photosynthesis, and in most gardens, that just won't cut it.

 

Grow Lights and Reflectors

The right light for any space will cover the required area while remaining a safe distance from the top of your plant’s canopy.  Higher powered lights such as 1000 watt double ended HPS systems are very bright and powerful. Designed to keep the sweet spot as large and as bright as possible, these work best with either a substantial amount of vertical space to allow for spread and dissipation in a smaller greenhouse type reflector, or a fairly wide reflector when used at typical heights to help spread all that light in a much wider, less intense beam.


If vertical height is a limiting factor, growers can still maintain these ultra high levels by utilizing multiple, lower wattage lamps spread over the garden in place of more powerful, centrally located ones.


Different reflectors throw different shaped lighting footprints. Selecting the right reflector can make the difference in efficiency regarding final hanging height. For example; many manufacturers offer a basic wing style reflector suitable for use with anything from a 250 watt Metal Halide to a 1000 watt HPS. With the proper hanging height these reflectors can effectively cover a 2’x4’ all the way through a 4’x4’ grow area. Proximity to reflective or light absorbing materials will also come into play.  Grow tents have varying degrees of reflective material designed to bounce light back into the plant area. If constructing your own grow room or space, other materials such as panda film (black and white poly) or Orca film can be used to help maximize and more efficiently use the light output from your indoor lighting system.


Best Light for Your Space

The numbers below are general guidelines for reflector height over plant canopies, as well as the amount of area (footprint) a light covers. These numbers may vary based on reflector size and shape, desired footprint and plants lighting needs, but they serve as a good . basis from which to choose the best light for your area and needs.


TYPE OF GROW LIGHT

HEIGHT

FOOTPRINT

1000 DE HPS

36+”

5x5

1000 HPS

24-36”

4x4

600 HPS

18-24”

3x3

400 HPS

12-18”

2x4

250 HPS

12+”

2x2

315 CMH

24+”

3x3

630 CMH

30+”

4x4

200 LED

16”

2x2

400 LED

16-24”

3x4

600 LED

24+”

4x4



In summary, we’ve looked at your plants’ health response to your current lighting setup and figured out whether or not too much light is an issue.  We’ve also talked about the Ugly, the Good and the Bad of lighting distance to your plant’s canopy to help you properly place your light. Finally we discussed what types of lights and reflectors may be the best fit for your space and ceiling height.  If you still have questions and would like help choosing a lighting system that’s right for your needs, send us an email at info@taphydro.com, stop by Taproot Hydroponics or give us a call at 404-464-8313 and we’ll help you make the right decision.

You can also leave a question or comment in our comments section.  Happy Gardening!


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I have a model1000 duel chip and fans made in China full spectrum I got a 3 way meter and at 20 inches my meter only shows100 at10 inches it is 500 my meter goes to 2000 at10 inches the temp is not to bad. Light don’t put out very much heat. How close should I have my light and how much area will my light cover? I have a 5×5 tent. What do you recommend for my tent. Thanks

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I have a model1000 duel chip and fans made in China full spectrum I got a 3 way meter and at 20 inches my meter only shows100 at10 inches it is 500 my meter goes to 2000 at10 inches the temp is not to bad. Light don’t put out very much heat. How close should I have my light and how much area will my light cover? I have a 5×5 tent. What do you recommend for my tent. Thanks

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