is a word that often comes up when talking about grow lights, but in fact this unit has very little significance when it comes to growing.

Lumen is a unit that describes how much of wavelength ~ 555 nm (green) a light produces. We use green to describe lights because green wavelengths are easiest of all colors to perceive by the eye. In other words, this is a unit that works best when describing standard bulbs and lights for indoor/work usage. Because LED light is monochrome we do not specify the lumen value of each respective light that is sold here. We could set it for the lights that are green LEDs, but it would still be a very misleading value to refer to.

This does not mean that green wavelengths has no function for plants, the opposite.
Green wavelengths in the right part of the spectrum and in the right proportion is what creates Anthocyanins (flavonoids) and in some cases betalaine, substances that give both taste, odor and color to plants. In recent decades studies have been conducted on these pigments where a lot of interest has centered on its various healing effects for everything from cancer to common cold and natural food coloring. There has currently been over 4,000 identified different of Anthocyanins and new ones are constantly found.

It should be added that when it comes to Anthocyanin it not only in the green light is produced. The majority of anths belonging has so-called double-peaks, with one peak in green light and one in the UV part of the spectrum (under 280nm). It is certainly not a technical impossibility to produce diodes in wavelengths that are below 280nm but cost wise it would be much too expensive, and UV LEDs have a lifespan that is 1/10 of ordinary diodes.
What is also important to add is that regular LED lamps for growing (usually has a ratio of 1:8 between blue and red) has a rather unpleasant light to look at. By combining blue, green and red wavelengths with a ratio of 1:1:2 like we do here at Gemma the light is no longer unpleasant and because it has the basis of white light at the same time as it fulfills all parts of the visible spectrum a plant need.

Click here to read what Wikipedia has to say about Anthocyanin

So far Gemma is the only company world wide which provided green wavelengths to its LED grow lights, and in combination with its exclusive optimized red and blue wavelengths, we can easily say that we have the best LED grow lights on the market today.

Red and blue light

Is the basis of survival for a plant where blue wavelengths generates stem and foliage growth and red makes fruit and flowers.
Tests (not performed by Gemma) shows that the wrong proportions or monochromatic light (only one color) inhibits growth and makes plants more susceptible to stress, therefore we will never sell LED grow lights with less than three different wavelengths as some manufacturers do.
In the plant kingdom, there are mainly two different types of chlorophyll pigment, A and B. Both pigments have different peaks in the light spectrum where they produce the most pigment, but where chlorophyll B in blue light is clearly superior to A and chlorophyll A is clearly superior to B in red. No indications have been found that it would make any difference to the plant which pigment is used, that is why we optimize and use only wavelengths that give as much pigment as possible for the least amount of energy.

Color reflectance representation

Daylight and our grow lights compared to regular LED grow lights.

Colors in daylight

Gemmas 2:1:1 (Red:Green:Blue) LED
Colors with Gemma LED

Standard 8:1 (Red:Blue) LED
Colors with generic LED 8:1