Red light is the key to a productive flowering phase and high yield.
Heavy-fruiting and flowering plants need great quantities of red light.
Unfortunately, many modern LED grow lights will give your plants a limited quantity of red light.
So, if you want to increase the intensity of red light, you have to buy separate supplemental grow lights.
Below, we’ll show you the best red LED grow lights you can use for that purpose.
Top 5 Red LED Grow Lights
If you’re searching for the highest quality red LED grow lights, then G8LED lamps are your best choice.
These award-winning G8LED lamps are made with the aim of maximizing yield for professional growers. They have a light spectrum ranging between wavelengths 630 to 660 nm.
The lower model, the all-red 90-watt G8LED lamp, has a coverage area of 3’ x 3’ (≈ 1m x 1m) at 12 inches with a PPFD of around 750 μmol/m2/s at the center.
As a supplemental lighting, that will be more than enough for your flowering plants and will highly increase the yield.
Although it has three cooling fans to dissipate heat, the lamp only draws 90 watts of power, so it’s very efficient.
If you have a growing area that measures above 10 sq ft (≈ 1 m2), you can use the higher model, the 270-watt G8LED lamp.
That light has a coverage area of 30 sq ft. (≈ 2.8 m2) or 5.5’ x 5.5’ (≈ 1.7m x 1.7m) with a PPFD of around 1050 μmol/m2/s at 14 inches.
G8LED lamps are high-priced compared to other grow lights, but their quality is superior, and their intensity is unmatched.
2. Growstar UFO
Growstar UFO is a more affordable choice than G8LED lamps, but it is less bright.
At 12 inches, the light puts out around 370 μmol/m2/s (at the center) and has a coverage area of 2’ x 2’ (0.6m x 0.6m). The PPF output of this light is nearly half of the 90-watt all-red G8LED lamp.
According to the company, this device is made to increase yield by 50%.
The light uses epiLED diodes that emit an all-red spectrum ranging between wavelengths 620 to 600 nm.
The device is equipped with optical lenses to improve light penetration, which also enhances yield by increasing photosynthesis in lower leaves.
The device only consumes around 50 watts of power, so it has a high PPF efficiency rate.
It has very good reviews on Amazon and it’s also very affordable.
A cool-looking grow light bulb, all-red Wolezek 36W is designed to enhance the light spectrum for flowering plants.
We don’t have information about its PPFD values, but looking at its wattage, we can conclude that it has a smaller coverage area than the lights we mentioned above.
If you have a big growing area, you’ll need to use several Wolezek bulbs to ensure that all your plants are receiving good quantities of red light.
The light can fit in any fixture of your choice, but you need to be able to adjust its height as your plants grow taller.
The device uses one type of diodes that have a wavelength of 660nm, so it has a monochromatic spectrum.
Wolezek 36W is more affordable than all the above choices, so if you’re growing plants in a tight space, this light will work well for you.
Luxbird 18W PAR38 is similar to Wolezek 36W, but it has less wattage and intensity.
It’s designed with 18 660nm LEDs so it produces a spectrum identical to that of Wolezek.
According to some growers, the lamp doesn’t have a good spread of light, so it’s best suited for providing light to individual plants.
The light is waterproof, so you can use it in wet environments.
Luxbird 18W PAR38 is great for growers who are cultivating a very small number of plants. It’s the cheapest light on our list.
HQRP is the last grow light on our list, because it’s the least bright all-red grow lamp among all the lights we mentioned.
It has a great spread of light, but it only consumes 14 watts of power, so it’s not very intense.
Although it’s advertised as a grow light, most people purchase this lamp for skin therapy.
Despite its low intensity, you can still use this lamp as a supplemental light for your plant.
The quality of HQRP LED grow light is not the best, but the device is very inexpensive, so it’s good for starters).
Here’s How Red Light Can Affect Your Yield
You already know that red light is important for yield, but here’s some specific data that will show you how red light exactly affects your plants productivity.
A study conducted in 2019 on basil plants showed that low red to blue light ratio resulted in lower yield. The highest yield was achieved when the amount of red light was three times that of blue light.
Low red to blue ratio also decreased the levels of volatiles in basil plants.
Another study done on strawberries (660 nm) found the highest rate of photosynthesis in plants that were grown under red light.
However, growing your plants exclusively under red light will lead to lower yield and impaired growth.
A study done cannabis showed that growing plants under red light only inhibited their bud formation. That’s because other light frequencies control important processes in plants, such gas exchange.
So, if you want to grow healthy and productive plants, you need to use a grow lamp or several grow lamps that produce a mixed spectrum of light.
You can read more about the best spectrum for flowering plants here!
Using supplemental red LED grow lights is a great way to enhance the light spectrum and boost yield.
However, make sure that your plants are receiving other frequencies of light, including blue, also.
Enjoy growing and don’t forget to share your thoughts in the comments below!