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Basic Info on Fluorescent Lighting for Cannabis Growing

Growing cannabis can be an enjoyable and rewarding hobby. However, to achieve the best results, you need to provide your plants with the right lighting. In this article, we will explore the basics of fluorescent lighting for cannabis growing, discussing the benefits, types of bulbs, and how to use them effectively.

What is Fluorescent Lighting?​

Fluorescent lighting is a type of illumination that relies on the excitation of a gas, typically mercury vapor, to produce visible light. These lights are known for their energy efficiency and have been widely used in both residential and commercial settings. In the context of cannabis growing, fluorescent lights can be an excellent choice for beginners or those with limited space as they provide a cost-effective and efficient solution.

Benefits of Fluorescent Lighting for Cannabis Growing​

There are several advantages to using fluorescent lighting in your cannabis grow:

Lower Heat Output​

Fluorescent lights emit significantly less heat than other lighting options, such as high-intensity discharge (HID) or high-pressure sodium (HPS) lamps. This makes them ideal for smaller grow spaces where heat management can be a challenge.

Energy Efficiency​

Fluorescent lights use less power than other types of grow lights, helping to reduce your electricity bill. This is particularly important for those looking to keep their energy consumption low.

Ideal for Seedlings and Clones​

The gentle light produced by fluorescent lamps is perfect for young plants, making it an excellent choice for the early stages of cannabis growth.

Types of Fluorescent Bulbs​

There are two primary types of fluorescent bulbs used in cannabis growing:

Compact Fluorescent Lights (CFLs)​

CFLs are small, spiral-shaped bulbs that can be easily screwed into a standard light socket. They are an affordable and versatile option for small-scale cannabis growers. CFLs come in various color temperatures, with cooler (blue) light being better for vegetative growth and warmer (red) light being suitable for flowering.

T5 Fluorescent Tubes​

T5 tubes are long, thin bulbs that require a specialized fixture. They are more powerful than CFLs and offer better light coverage. T5 tubes also come in different color temperatures, making them suitable for both vegetative and flowering stages of cannabis growth. T5 fixtures can be easily configured to hold multiple tubes, allowing you to create a custom lighting setup for your plants.

How to Use Fluorescent Lighting in Your Cannabis Grow​

To get the most out of your fluorescent lighting, follow these tips:

Choose the Right Spectrum​

Select bulbs that offer the appropriate color temperature for your plants' growth stage. Use cooler (blue) spectrum bulbs for the vegetative phase and switch to warmer (red) spectrum bulbs during flowering.

Maintain Proper Light Distance​

Keep your fluorescent lights close to your plants – typically between 2 to 4 inches away – to provide them with adequate light without risk of burning. Adjust the distance as your plants grow.

Provide Adequate Light Coverage​

Ensure that all your plants receive even light coverage by arranging your bulbs or fixtures accordingly. This may require adding more bulbs or adjusting their positions as your plants grow.

Monitor and Adjust Lighting Schedule​

Cannabis plants require different amounts of light during their various growth stages. During the vegetative stage, provide 18 to 24 hours of light per day. When transitioning to the flowering stage, reduce the lighting schedule to 12 hours of light and 12 hours of darkness.


Fluorescent lighting is an excellent option for cannabis growers looking for an energy-efficient and low-heat lighting solution, particularly for small-scale operations or those just starting. By selecting the right type of bulbs, maintaining the proper light distance, and adjusting your lighting schedule, you can achieve a successful cannabis harvest using fluorescent lights.
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very thorough, thank you! (but I didn't see the link or pix).
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