Top 5 Best Light for Flowering ( 2023 Reviews)

Cannabis is like humans – it has different needs in the different stages of growth. For instance, while a light is an essential element for growing weed in a grow room, it does not mean that it needs the same type and amount of light from the time it is planted up to the point that it will be harvested.

At different phases, the light needs will differ. Are you looking for the best light for flowering? Let me start by saying that the light that the cannabis needs at such stage is different from what it needs when it is vegetating.

That being said, if you want to find the best light that could trigger the growth of healthy flowers that will positively impact yield, read on and learn from the insights we will be sharing below.

Best T5 Bulbs for Flowering

#1 Lightingwise Fluorescent Grow Light Bulbs Review

With a length of four feet, this is a T5 fluorescent that will be great during the flowering stage of marijuana, which can be basically attributed to the fact that it has a light output of 5,000 lumens and 3000 Kelvins. It also has a red spectrum, which is exactly the reason why it is perfect for the bloom phase of marijuana.
The durability of this T5 light is also hard to question. In fact, it is one of the reasons why this is a good product to choose. The depreciation rate is only 8 to 10% throughout its lifespan. It also consumes less energy, making it an efficient alternative.

Q&A: Can it also be used during the vegetative stage?

This is a light that comes with a red spectrum. Safe to say, it is designed only to induce flowering and not for vegetating. Once the cannabis is done with the vegetation phase, it will make a good replacement to the old bulbs that you have.

Q&A: What is the lifespan of this product?

Based on the information from the manufacturer, the rated lifespan of this bulb is 20,000 hours.

Best Light for Flowering Cannabis – LED

#2 ABI 12W Deep Red LED Bloom Booster Grow Light Review

As it will be discussed later, red is the spectrum that is more suitable for the marijuana when it is in the flowering stage. Blue, on the other hand, is the more important color during the vegetative growth of the plant. This LED light delivers 660nm of red light, which is more than enough to induce flowering.
Because this is a LED light, expect that this is going to last for a long time. Based on the specifications from the manufacturer, the rated lifespan of this light is 50,000 hours.
For your peace of mind, the light comes with a three-year warranty from the manufacturer.

Q&A: What is the beam angle of this light?

Looking at the specifications from the manufacturer, you can see that the beam angle is at 30 degrees. This means that it does not direct the light to the plant. The angled distribution of light is important to prevent any direct damage to the leaves.

Q&A: Is it suitable for multiple plants?

Sadly, this is not made for multiple plants in a grow room. Take note that it only has 12 watts, which is why it can be too weak when it is used for multiple plants. For best results, use it only for one weed.

Best Light for Flowering Stage – Full Spectrum

#3 MSMKEJI 300W Led Grow Light for Indoor Plants

If there is one thing that makes this unique, it would be the fact that it is a full-spectrum light. It comes with lights in different colors, a total of 60 5-watt LEDs. Out of this, 16 are red, which is why this is an option that can also prove to be promising when it comes to the flowering of marijuana.

One more thing that makes this great is the heat dissipation. This is unlike others that can easily make the grow room hot. Also, there are two built-in fans that can provide effective cooling without making an annoying noise.
The manufacturer offers a three-year warranty for this product.

More so, if you are unhappy within 30 days, you can have it returned to the manufacturer and you will be issued an unconditional refund.

Q&A: How far should it be away from the plants?

Based on the recommendations from the manufacturer, it should be around 24 inches away from the plant when it is a seedling, 18 inches during the vegetative phase, and 12 inches during the flowering stage.

Q&A: Can you choose a specific light spectrum?

Unfortunately, there is no option to choose whether you want only the red or blue lights depending on the stage of the growth of the plant. The LEDs are turned on at the same time.

#4 ViparSpectra VA600 600W Full Spectrum led Grow Light


If you are looking for a durable and safe LED light, don’t miss this model from ViparSpectra. This is an LED grow light that provides full spectrum and is especially good for the flowering stage of houseplants.

This LED provides full spectrum, including IR, well support for all vegetative stages of plants. Besides, this LED also uses Dual Chip LED (10W) as well as the latest technology to deliver high efficiency while saving energy.

This model received UL certification and so growers need not worry about its safety issue. This LED is also very easy to set up and you can link up with many other LEDs without any extra wiring or complicated setup as the Daisy chain feature is included.

Q&A: How is the heat dissipation system of this LED?

This LED uses upgraded aluminum cooling heat sinks and advanced high-speed quiet fans for its cooling system. So this LED is always maintained at a stable temperature even when continuously operating for a long time. And it doesn’t make annoying noises either.

#5 ViparSpectra XS1000 120W Infrared Full Spectrum LED grow light


We believe that ViparSpectra is currently the leading LED manufacturer with quality product lines and reasonable prices. And among them, this XS1000 120W Infrared Full Spectrum LED grow light deserves to be on your priority list.

This LED grow light provides full spectrum with 660nm of red led, 3000K and 5000K of white led and IR led. These lights can support plants at all stages of growth, including flowering.

In particular, this LED light comes with a flexible dimmer knob that allows growers to adjust the brightness from 5% to 100% brightness. Growers can take advantage of this function to stimulate plants to produce more flowers with growing techniques.

Q&A: How is the coverage of the LEDs?

This LED grow light has a fairly wide coverage. Growers should be set up properly so that this LED can provide the most perfect coverage of 2.5’x2.5’ vegetative coverage at 18” and 2’x2’ flowering coverage at 14” height.

Q&A: Does it come with any warranty?

Yes! ViparSpectra offers customers a 36-Month US Local warranty. In addition, they are also willing to support refunds for customers within 30 days if there is a problem with the order.

Lighting Needs of Marijuana During the Flowering Stage

Now that we have briefly discussed some of the models that are worth taking into account, let us have a look at the lighting requirements of marijuana once it reaches the flowering phase.
According to experts in cannabis cultivation, the best light spectrum for flowering of marijuana is red, which explains the products that we have listed above.
More than the spectrum of the light that you are using, the lighting duration is also important. If the light used to be turned on about 18 hours during the vegetative phase, when the plant reaches the flowering stage, you need the light only for 12 hours a day. After about two weeks of having a cycle of 12 hours on and 12 hours off, the buds will start appearing on the marijuana.
The light intensity is also important, which will be all about the power of the lights that you will be using. On average, you should use a 40-watt light for every square foot.

Care for Marijuana During the Flowering Stage

While it is indeed helpful to have the best light for flowering, this is not enough to take care of your plant during such stage. With this, here are other important things that you should do to increase the likelihood of having healthy flowers:

  • Watch out for any signs of dead leaves and branches. If you can see any, remove them as soon as possible. This will also prevent the problem from spreading to the healthy parts of the plant. However, if there seems to be no problem, do not cut it.
  • The humidity level should be at around 50%. It is important to pay attention to humidity to prevent the presence of mold. Mold will form when the humidity is too high since the plant will absorb the excess moisture.
  • Installing a carbon-filtered airflow system will be beneficial for the grow room. This will maintain proper air circulation in the grow room, which is also important when it comes to the prevention of odor.
  • Introduce the right nutrients at the right time. Within the fourth to sixth week of flowering, the weed will benefit from being fed with potassium and phosphor. They will support flowering. Nonetheless, make sure that you avoid overfeeding as this could cause stress to the plant.
  • If you have a hydroponic system, the management of the pH level will be critical for the health of the plant. Even in the soil, pH has a big role to play. The wrong pH level can cause curled leaves. For marijuana grown in soil, the right pH level at this point should be 6.0 to 7.0. On the other hand, with hydroponics, the pH level should be from 5.5 to 6.5. There are portable pH testing kits that can be used.

Wrap Up

The best light for flowering is indeed an important component of your grow room setup. The plant needs more than enough red spectrum to trigger the growth of healthy flowers. Without the right light, the external environment will fail to provide what the marijuana needs to be able to survive in an enclosed setting.