T5 Grow Lights

T5 grow lights provide an excellent method of indoor cannabis cultivation. Their efficiency, affordability, and versatility make them a great choice for both personal and commercial cultivation. When choosing T5 grow lights, it’s essential to consider factors such as wattage, size, and spectrum to harness the full potential of these lights. Proper care and setup can make a world of difference for better growth results.

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Written By Roy Stevens

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Quick Answer

“T5 grow lights are fluorescent lights specifically designed for horticulture. The “T” stands for tubular, and the “5” refers to the diameter of the tube, which is 5/8 of an inch. These lights are known for their efficiency, low heat output, and ability to produce a full spectrum of light essential for plant growth.”

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HTG Supply T5


Hydro Farm T5


Durolux T5

What are T5 Grow Lights?

T5 grow lights are fluorescent lamps that are one of the most effective and cost-efficient ways for indoor cannabis cultivation. These lights have been used for indoor growing for years and have been widely embraced by most cannabis growers around the world.

T5 grow lights can come in either single, double, or even quadruple bulbs. Each T5 bulb has a diameter of ⅝ inches, unlike their T8 or T12 fluorescent counterparts, which have a diameter of 1 inch. T5 fluorescent lamps are much better for growth because they emit plenty of light and are suitable for the vegetative stage of cannabis growth.

Benefits of T5 Grow Lights

There are several benefits of using T5 grow lights for cannabis cultivation instead of high-intensity discharge (HID) lamps like High-Pressure Sodium (HPS) or Metal Halide (MH).

One of the most significant advantages is that T5 grow lights are much cooler than HID bulbs such as HPS and MH, making them more versatile and cost-effective. Heat reduction is especially vital for indoor cultivation, as heat output can affect both the plant’s growth rate and the surrounding environment.

Another advantage of T5 grow lights is their high efficiency, which translates to lower electricity bills. T5 bulbs can use up to 75% less electricity than HID bulbs. While the initial cost of T5 bulbs is higher, the energy savings are passed on to the user over time.

T5 bulbs are also known to provide better light spectrums for plant growth and photosynthesis. They emit light in the blue spectrum of 6400 Kelvin and 6500 Kelvin, which is the optimal range for vegetative growth. The blue spectrum helps keep the stems and leaves shorter, provides more even canopy growth, and avoids the stretching seen in plants cultivated with HPS lights.

Choosing the Right T5 Grow Lights

When looking for T5 grow lights for cannabis cultivation, there are various factors to consider. Some of these considerations include wattage, size, and spectrum.


Wattage is the measure of electrical power needed to operate T5 bulbs. Higher wattage means more power consumed, leading to increased energy bills. It’s important to note that more wattage doesn’t always translate to more light output. The most popular wattage for T5 grow lights is between 24 and 54 watts.


Another essential factor to consider is the size of T5 grow lights. Smaller bulbs can be used to light up smaller areas, which is great for personal use or for home cultivation. Larger bulbs are best suited for commercial setups because they can provide better light dispersion for larger rooms.


T5 grow lights provide either dual spectrum (red and blue), or tri-spectrum (blue, red, and daylight) bulbs. The dual spectrum is ideal for the vegetative stage, while the tri-spectrum is ideal for both the vegetative and flowering stage of indoor cannabis cultivation.

Why Choose T5 Grow Lights

Cost-Effective Solution

For home growers, budget is often a significant consideration. T5 grow lights offer a cost-effective solution without compromising on quality. They are generally more affordable than HID lights and other advanced lighting systems, making them an excellent option for beginners.

Ease of Use

T5 grow lights are user-friendly and easy to set up. They typically come with plug-and-play functionality, allowing you to get started with minimal hassle. This ease of use makes them ideal for those who are new to cannabis cultivation.

Versatility in Growing Environments

Whether you’re growing in a small closet or a dedicated grow room, T5 lights are versatile enough to fit any setup. Their compact size and flexible mounting options make them adaptable to various growing environments.

Other Relevant Factors to Consider

1. Reflective Surfaces
Light reflection is a critical factor for indoor cultivation. Reflective surfaces such as Mylar or white walls help increase light intensity and contribute to better plant growth.

2. Cooling Systems
T5 grow lights produce less heat than HID lights, but it’s still essential to provide adequate cooling. Cooling fans, exhaust fans, or ventilation systems can help regulate temperature and humidity levels.

3. Proper Distance
Keeping the light at the right distance is crucial for good growth. T5 bulbs should be placed about 2 to 6 inches above the canopy for optimal lighting.

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