Augmenting greenhouse with blue and far red LEDs

I’ve done a few posts about the benefits of blue and far red lights on plants.  I’ve used them on my seedlings.  Now that I have no seedlings for the moment, I wanted to try them out in the greenhouse.

But the greenhouse is outside, right?  It already has the sun, right?  Yes and yes.  However, exposing plants to a higher concentration of blue light before sunrise, can begin the process of the plant opening its stomata (pours the plant uses to “breath” out water and breath in CO2) to make it more ready for photosynthesis and ultimately carbon fixing and growth.

Far red light benefits at the end of the day are already covered in a different blog.  The higher concentrations should help -especially because trees and other objects shade the setting sun from my plants.

I’m trying to put growth and fruit production into overdrive.  My max expected yield should be somewhere around 1-2lbs of tomatoes per day.  I’m getting close to 1lb every 2-3 days.  The blue light along with CO2 boosting in the morning should help with growth and production.  I expect to see less suckers on my tomatoes and more growth with the far red light as well.

My red and blue lights are enclosed in flood light housings.  It was pretty easy to set them up this way.  I used a carabiner to hang them from the wire over my second bed.  I then pointed the lights at my tomatoes and ran the power cord to the ubiquity mfi mpower strip that I recently installed.  The cool thing about the mpower strip is that you can control it over wifi -so I can tie it into my automation system, but it also supports simple schedules including location-based sunrise/sunset.  I created a schedule that starts the blue light 1hr before sunrise and turns it off 1hr after sunrise.

The blue light looks really cool at night.  This is what a 50 watt LED can do.

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The schedule I set up for the far red LED was 30 mins before sunset, and turn back of 1 hr after sunset.  It isn’t visibly as bright as the blue, but my infrared camera sees the difference.

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I’ll try to remember to follow up if I notice a difference.  If I forget, comment below and I’ll either respond with my findings or make a new “results” post.

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