Blue LED Grow Lights: Best Fixtures For Seeding And Vegging?
Last updated June 19, 2020 By Steven 2 Comments
Let’s clear up a big misconception right away.
Blue LED grow lights are not the best choice for vegging.
Plants in the vegetative stage love blue light, that is true. But they don’t want only blue light.
They do much better if they are also getting light in every other color, especially red. They want: mostly blue, a good amount of red, and some of every other color.
So what are blue lights good for then?
Well, they do work for vegging. They’re just not ideal. The same goes for seeding.
Apart from the first light listed below, which includes some white diodes and thus has light in every color, blue LED panels and bulbs are best used as supplemental lighting.
That is their strength.
If you have a primary light that is mostly red, these blue fixtures are a great way to increase the blue light hitting your plants.
Red-heavy fixtures are often used for flowering. By providing some additional blue light during the vegging stage, you can give your plants better light for that stage, without having to get a whole new lighting fixture.
These blue LED fixtures are all extremely inexpensive, making them a nice, cheap way to boost plant growth.
But you do have to make sure you get a good one. Many of the options out there are completely useless. That’s why I’ve narrowed them down to the best few. I also included a more expensive full-spectrum light below, in case you are not looking for supplemental lighting, but a fixture that can veg on its own.
Let’s take a closer look at the lights.
Blue Spectrum LED Grow Lights: Comparison Table
|HLG 300L BSpec
How Does Blue Light Affect Plant Growth?
Before we get to the individual reviews, I wanted to briefly explain what blue light does for plants. This post has a more in-depth explanation of the effect of different colors of light on plants.
Blue photons drive the photosynthetic reaction and blue light regulates the opening of stomata. Those are minuscule openings on that leaves that control water loss carbon dioxide intake.
The most important function for our purposes is that blue light suppresses extension growth. This results in shorter plants with thicker, bushier leaf growth. Without blue light, plants will stretch and grow spindly and weak.
Best Blue LED Grow Light: Review Of The Top 5
These are the top 5 blue spectrum LED grow lights currently available. I’ll begin with the best vegging light period (though it uses blue-heavy white light, not blue light), and then follow with the best blue bulbs and panels.
Best Blue LED For Vegging And Seedlings: HLG 300L V2 BSpec
This light has some blue LEDs for a vegging boost, but is mostly made up of full-spectrum white LEDs.
So why is it my favorite light for vegging and for seedlings?
Because white light is far better for plants than only blue light. White light contains all colors of the spectrum, just like sunlight. And that is what plants really want.
The HLG 300L V2 Bspec uses high quality Samsung LM301H diodes with a color temperature of 3500K. That is a warmish white light that will actually work for any stage of growth, but it contains a good amount of blue light, making it especially good for vegging.
The fixture also has 470 nm blue diodes to supplement the white light and really provide a vegging boost.
The one thing HLG lights are famous for is their efficiency. They give you a far greater output for the wattage input than other LED lights. This is largely due to the Samsung chips and Meanwell drivers, both of which are the industry standard.
The driver is also dimmable, from 90 to 270 watts. This means you can dial down the power when you don’t need the light to be as strong, which saves you money. If you are using it for seedlings, for example, you probably won’t need it on full power.
HLG lights give you are large, even coverage area due to the way they are configured, with many smaller diodes spread out over a large panel. This also means they can be cooled passively, so there is no need for a noisy fan to dissipate heat.
Horticulture Lighting Group provides a 3 year warranty on their lights and they are very good at follow up service, if you have any issues. Customer service is the area where they have made a ton of improvements over the past year and now rank among the top brands in that department.
- Great spectrum with mix of 470 nm blue and 3,500K white diodes
- Incredible efficiency of 2.5 umol/j (it is a 600w MH equivalent light while using only 270w)
- Extremely high quality components
- Most expensive light on this list by far (but it is a standalone fixture, while the others are really just supplemental lights)
Best Blue LED Grow Light Bulb: ABI True 24 Watt Blue LED Bulb
The 24 watt blue blue from ABI is the best blue LED grow light bulb on the market. It rates above the other good choice further down this page, because it is more powerful, though it may not seem like it at first glance. And also for honesty and quality.
This bulb is 24 watts and that one is 36 watts, so how is this one more powerful?
Because 24 watts is the actual power draw, while the other bulb below has an actual draw of 20 watts. In general, the 2 bulbs are very close, but I gave this one the edge in power and in being honest about that power.
Instead of calling their bulb a “45 watt” light, like most Chinese brands would, they call it a 24 watt light, because that is the actual power consumption. That kind of honesty should be rewarded, especially in an industry where it is exceedingly rare.
But honesty isn’t the only thing ABI has going for them. They also make a great little bulb.
It screws right into any standard light socket (E26), so you can use it in an existing lamp fixture you may already own. The diodes emit a blue light with a wavelength from 450 to 460 nm.
The reason this bulb is able to get more power than most competing bulbs is an integrated ball-bearing cooling fan. It runs quiet, but keeps the temperature down, which makes it possible to get more power into a bulb this size than usual.
The ABI bulb is assembled in the USA from quality components. It is rated for 50,000+ hours of use and comes with a 3-year manufacturer’s warranty.
- Works in any standard light socket (E26)
- High output for a LED bulb (with a 24 watt power draw)
- Assembled in the US from high-quality components
- 3 year warranty
- ABI does not provide lumen or PPDF info
Thinnest Blue LED Light Panel: Yescom Blue Ultra-Thin LED Grow Light Panel
The Ultrathin 225 LED Panel from Yescom is the thinnest grow light I’ve ever seen, apart from strip lights. That makes it a great choice for supplemental light. I would not use it as a standalone fixture, though.
The main reason for that is the limited spectrum. As the only light source, you’d want some light in every color, not just blue. Even for seeding. For that reason, I recommend the first fixture listed above if you are looking for a standalone seeding light.
But if you’re looking to supplement an existing light with some additional blue light, this fixture will do just that. And its small size gives it some more flexibility than the first fixture on this list.
This light only draws 22 watts, but has a lumen output of 2475. That gives it more output than the first fixture, but this light has no lenses, so the light is not as focused and won’t penetrate as deeply into the canopy. That said, canopy penetration is not a strong point of any of these lights, nor is it something you’d expect in a supplemental light.
The 225 diodes on this panel emit a blue light with a wavelength of 450 nm. The panel has a rated lifespan of 50,000 hours. Yescom does not provide a warranty. The same fixture is also available with white diodes, instead of blue. Using the two in combination could be a great idea, depending on the kind of light your plants are already getting.
- Great output for only 22 watt input
- Ultra-thin and light weight
- 50,000 hour rated lifespan
- No warranty
Great Alternative LED Bulb: HiGrow 36 Watt Blue LED Grow Bulb
The ABI bulb reviewed above is my favorite, but this 36 watt blue bulb from HiGrow is a close second. My main issue with this bulb is the fact that it only draws 22 watts of power, not 36 as stated, and it is lower quality.
Obviously I know that every Chinese brand (and many US brands) follows this naming convention that is best referred to as “lying”, but ABI does not. I like that.
Either way, the ABI bulb is more powerful than this one, though they do not provide any actual output data, unfortunately.
HiGrow does provide some data, which states that their blue bulb gives you 1046 lumen of light. It uses 18 all-blue 2w Bridgelux/Epileds diodes with a wavelength of 450 to 460 nm. 90° lenses focus the light downward into a more intense beam.
Like the ABI bulb, this one also screws into any standard E26/E27 light socket. Unlike that bulb, this one does not have a fan, but uses 0603 aluminum heat sinks. They work well, but without the fan, this bulb can’t quite generate the same type of power as a fan would allow.
This bulb is made from lower quality components than the ABI bulb (plus it’s assembled in China), so you can expect a bit of a higher failure rate (i.e. your chances of getting a bad bulb are slightly higher), which is another big reason I prefer the ABI bulb. That said, HiGrow give do you a 1 year warranty and a 30 day money back guarantee.
- Screws into any standard E26/E27 light socket
- Rated lifespan of 50,000 hours
- 1 year warranty and 30 day money back guarantee
- Lower power than the ABI option
- Lower quality components than the ABI bulb
Best Budget Blue LED: Miracle LED 100 Watt Starter Bulb
The Miracle LED Grow Lite Growth Starter bulb is a bit different from the other lights on this list. It looks exactly like a standard incandescent lightbulb.
Naturally, it screws into any standard socket (just like the two LED bulbs above). Where it differs is the price. Those bulbs are cheap. This one costs even less.
Miracle LED claim this bulb can replace a 100 w bulb while only consuming 9 watts. I’m not sure what they mean by 100w, but I’m guessing it must be a 100w incandescent bulb and not fluorescent.
As you can probably imagine, a light that only uses 9 watts is not super powerful. That said, the Amazon listing says it emits 1900 umol.
Honestly, that is ridiculous. They don’t say what height that was measured at, but no matter how close you get to this bulb, no good PAR meter is going to read 1900. That figure is nowhere to be found on the Miracle’s own site, so I have no idea where the Amazon seller pulled that from.
Bottom line: this bulb is fairly dim and easily the least powerful on this list.
Due to the lower output, I doubt this light would be very effective as a seed starter, despite the claims. It could work for a couple of seeds in the same pot directly below the light, but not for a substantial amount of seeds. For that, the first light on this list is much better suited. And it really doesn’t cost too much more.
That light also has a better spectrum, thanks to the white diodes. This Miracle LED light emits only one wavelength: 475 nm, which is blue.
Miracle LED provide a one year warranty. Since the bulb is so cheap, you could get a bunch of them (ideally some blue, some white, some red) and use them in combination. Added up, they could be effective, similar to how you’d use a number of CFL bulbs to grow a single plant.
Blue LED grow lights are great for seeding or vegging. But the truth is, plants want more colors than just blue. For that reason, these fixtures are best suited for…
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What to look for when buying LED grow lights
Below we have rounded up what to look for when shopping for LED grow lights, followed by a list of the the best LED grow lights available on the market today.
The type of light you use has a monumental effect on your cannabis growing efforts. Many factors go into what LED light to use for growing cannabis. We did the research for you and have rounded up the most important ones below.
- While plants can grow under most spectrums, to make the process efficient they need specific wavelengths throughout each growth stage. High quality LED lights provide the full spectrum of light, allowing you to select the best one for each growing stage. Plants naturally react and grow based on the spectrum of light they get outdoors. They will grow as long as they receive blue and red lights, though most good LED lights offer the full spectrum. The spectrum you use in different stages will affect the plant’s growing patterns.
- Blue lights (400nm — 500nm): Blue lights are often used in the vegetative stage of growth. That’s because this spectrum mimics the sunlight during summertime. Plants use this blue spectrum as a hint to spread its leaves in order to soak up as much sun as possible during the summer. It’s recommended to use blue light during the plant’s vegetative stage so it spreads and grows leafy. However, if you use blue light throughout growing you’ll get plants with short stems but with large healthy leaves.
- Red lights (660nm — 730nm): Red or yellow lights are often used in the flowering stage of growth. This spectrum mimics the sunlight during the fall. This is when plants grow tall to prepare for the upcoming winter. Taller plants are in a better position to bud and pollinate via winter winds. Using more red light stimulates your cannabis to grow taller and flower (promoting bud growth).
- Since you’re playing the role of the sun, you can choose the optimal spectrum of light for the strain of weed you’re growing. Most LED grow lights come with customized spectrums of light that are optimized for speedy growth. Manufacturers often state the great PAR of their LED grow lights. Photosynthetically active radiation, or PAR, is the wavelengths of light between 400nm and 700nm. These wavelengths are the best for photosynthesis.
Amount of light
The more ligh t your plants receive, the better they grow. So, how do you find an LED grow light that emits the highest quantity of light? For one, LED lights are already designed to directly aim at the plant. Panels that are 3W per bulb produce the highest yield without burning the plant. More panels help spread light over more area. It’s recommended to use an LED grow light with over 2 panels if you plan on having a large growing space.
Wattage per square foot and coverage area
Your grow lights will be running for long hours, so you’ll want to save electricity.You’ll want to check the electrical output of your light, which should optimally stay over 300W. If the wattage is too high, you can run the risk of burning your plants. The recommended amount for growing cannabis is 50–60 watts per square foot. You will also want to know how much area your lights can cover. Most lights we recommended today have a coverage area of 3 ft x 3 ft at the vegetative stage.
Low heat emission
It’s important to find an LED grow light with low heat emission. You don’t want to run the risk of burning or discoloring your plants. You can put lights with low emission close to your plants, allowing them to receive more direct light. Controlling the temperature of your grow room is important for saving electricity and room temperatures contribute heavily to plant growth. If the air is humid, similar to the tropics, your plants grow optimally. Grow lights that emit too much heat turn the air dry, meaning your plants won’t grow.
Quality of materials
LED lights can be an expensive investment and the quality of your light source highly affects the yield. You want an LED light that gives off 3W per bulb, meaning the semiconductor chip needs to be of high quality. You need to look for durability; very durable LED grow lights last for 50,000 hours plus. Look for manufacturers that state longer warranties (2 years plus). They are most likely using the highest quality materials. Most grow lights we suggested today come with a hanging hook and power cord.
The New ECO Farm LED 600W Vertical Farming LED Grow Light takes Vertical Farming into the new era. Fully equipped with the Latest in High End LED technology from the best of Samsung, the best of CREE & best from Meanwell. ECO Farm 600W which delivers uniform light intensity and promotes uniform growth across your canopy. Dimming gives you full control of your intensity and allows you to only use what you need taking efficiency to the next level, reducing btu output and extending the lifespan of the fixture. The ECO Farm 600W using Samsung LM301H ,delivers industry best efficacy for LED Grow Lights with Samsung LEDs at 3.0 umols/j. Double Row LED strips with 2,760 LEDs all being under driven to max efficiency to deliver next generation Par efficacy and a mind blowing 1200+ ppfd at 10″ & 12″.
ECO Farm 600W is the first Vertical Farming style of light to integrate Blue LEDs with the Red LEDs to make the light easier to absorb at high intensities and promote best possible bud quality. ECO Farm 600W is also the first to feature Samsung’s LM301H LEDs in a high power LED grow Light that flowers a 4×4 area or bigger.
The Loriflux 8 blade is full spectrum top and vertical lighting solution designed and engineered by growers for use in full cycle cultivation. With variable power levels and a rigorously developed and field tested spectrum, our light vastly simplifies the growing process while allowing even the most seasoned veterans the control and power to exceed yields beyond anything they have ever experienced. For optimal results we recommend that this fixture is used in environments with supplemental CO2 at a range of 800–1400PPM due to high concentration of PPFD.
Optimized spectrum engineered and tested by growers
Scientifically engineered to maximize photosynthesis, growth, and yield
2.0 gram/watt field produced yield (dried)
Superior delivered PPF and PAR exceeding 1000 Watt HPS grow light.
Almost 50% energy savings over traditional HID and HPS
40% less HVAC usage
Cultivate Tech’s GrowtechX660 is a 660W, full cycle LED grow light designed to target only the parts of the spectrum your plants need to thrive through both vegetative and flowering cycles. At 660 TRUE LED watts, the GrowtechX660 is the equivalent to approximately 1100 HPS or metal halide watts, meaning, it runs on nearly half the wattage of traditional grow lights. Importantly, all fixtures in the GrowtechX Series carry an ETL label, meaning they are thoroughly tested and in compliance with North American safety standards.
Both the GrowtechX480 and GrowtechX660 are designed to fold 180 degrees to make it more compact and easier to transport and install.
With the use of passive cooling technology, Cultivate Tech fixtures produce virtually no heat so no additional air cooling is required for your grow space. This also eliminates the need for additional fans (internal or external), so running a Cultivate Tech fixture will be virtually silent and drastically increase the longevity of the fixture. The lower temperatures from lighting results in an ideal, easier to control grow environment for your plants to flourish in. Without the threat of “leaf burn”, Cultivate Tech fixtures can be placed mere inches from the plant canopy which is ideal for optimal light absorption and necessary for vertical grow application.
All products in the GrowtechX series are 0–10V dimmable. By purchasing the optional Zigbee gateway and controller, the grower will have the ability to adjust light intensity, group multiple fixtures together to be controlled simultaneously, and program timers all via WiFi. Timers can be stacked to adjust light intensity several times throughout the day to mimic a sunrise/sunset cycle. The Zigbee gateway plugs directly into your router via ethernet cable, and the controller plugs easily into your GrowtechX fixture. The gateway syncs easily with the controller and with the iLightsPro app you will have full control over your fixture(s) on any mobile device. Multiple fixtures can be connected together using a single power supply and then grouped together to be controlled simultaneously.
Below we have rounded up what to look for when shopping for LED grow lights, followed by a list of the the best LED grow lights available on the market today. The type of light you use has a…