Contact Us

Use the form on the right to contact us.

You can edit the text in this area, and change where the contact form on the right submits to, by entering edit mode using the modes on the bottom right. 

4751 York Street
Denver, CO 80216

farm tech, farm food, farm style

Green Light

Green Light

Feature 1

The following is placeholder text known as “lorem ipsum,” which is scrambled Latin used by designers to mimic real copy. Donec ac fringilla turpis. In sit amet felis malesuada, feugiat purus eget, varius mi.

Plant Science Topics:


-Plants generally reflect green light

-Photoperiod signaling

-Inhibit stomatal opening

-Canopy penetration

-Role in phototropism


Recommendations to Apply the Science:


-Low intensity work lights

-Make crop scouting easier

-Increase canopy penetration to reduce pruning


Product References:


-Active Eye Green LED Flashlight

-Active Eye Green Work Light

-Active Eye Green Cap Light

-Sunburst CMH

-Phantom DE

-Solar System 550

-Jump Start T5 48W 4' LED Strip/Reflector Fixture

-Jump Start 24W 2' LED Strip/Reflector Fixture

-powerPAR Commercial 4 ft LED Fixture



Episode 5: Green Light (500 nm to 570 nm)


Shhhhh, I am completely camouflaged. In this Episode of Plants and Light, we look at the color that plants can barely see, Green light.


Plants generally reflect green light, that’s why they appear green, because they absorb the other colors but reflect green. The human eye is very sensitive to green light, our eye’s crave it. If you’ve ever been in a grow room with just blue and red LEDs, you’ll notice everything looks green once you walk out of the room, that’s how much your eye wants green in the spectrum. Well plants have difficulty seeing green. Many growers take advantage of this by using green light to check plants during the night without interrupting the plant’s photoperiod. This was shown in Episode 2, where short day plants continued to flower even though they were exposed to green light during their night cycle.


The intensity of the green light is important, if it is too intense it can trigger photoperiodic responses, but at low intensities is can be used safely


There are a lot of green light options (show spectrum of green lights used). These lights are super useful if you need to check on your crop at night. Lots of growers like to run their lights at night when it is cooler out, and electricity prices are cheaper. But they still want to work with their plants during the day. So green light! Or if there is an emergency, like flood or power outage or pump failure or who knows, it’s great to have an option for checking plants without disrupting their flowering cycle.


some of the early studies on light spectrum seemed to suggest that plants did not use greenlight for photosynthesis, but these experiments only used a single leaf


(coming out from bush) further experiments that used full plants however seem to suggest that greenlight can penetrate the plant canopy and provide some energy for photosynthesis in lower leaves.


(coming out of another bush) Green light has also been shown to reverse some of the blue light stimulated plant responses. Like phototropism and stomatal opening. When plants are exposed to a flash of green light after a flash of blue light, it can reverse the blue light stimulated opening of stomata. (closing of stomata said as I close bush around me)


(sitting at coffee shop with cup of coffee) so, the most practical applications of green light in horticulture are generally checking crops without interrupting photoperiod or providing energy for photosynthesis deep into plant canopies. The first application we’ve covered, but using green light to penetrate a plant canopy is an interesting one. Many indoor growers heavily prune their crop, primarily the lower leaves. This is for several reasons including air flow, but another reason is that these lower leaves often use more energy than they collect. They are an overall drain on the plant, using more resources than they provide. It’s possible the inclusion of greenlight in a grow lights spectrum could help provide energy for these lower leaves and cut back on the need for time intensive pruning. (images of scrog’d pepper crop)


Some grow lights that provide some green in their spectrum are CMH, HPS, white LEDs


This has been episode 5 of Plants and Light. To learn more on horticultural light visit In the next episode we take a stop at Red light, stop, at red light. Jokes! Alright thanks for watching. I’m Farmer Tyler and the more you know the better you grow.