What's the difference between T5 and other fluorescent bulbs?
Written by
Benjamin Miller
Reviewed by
Prof. Charles Hartman, Ph.D.For your houseplants to thrive indoors, it is essential to understand the differences between various types of fluorescent bulbs. T5, T8, and CFL have differences in their designs that impact performance and applications; the apparent difference of the bulb types you're buying matters in plant growing. Each bulb has its own specific use for growing plants. Having run the three bulbs within my greenhouse, I believe it is essential to understand the differences to avoid mistakes, which can result in financial losses.
T5 systems take the lead with better lumen efficiency. They can produce an additional 40% light than a T8 equivalent with the same amount of energy. They also allow for more compact arrangements due to the smaller profile. I have been using them for commercial lettuce production. Their intensity will enable me to grow lettuce in thick canopies.
T5 Performance
- 5000+ lumens output at 54W power
- High-output ballasts increase efficiency
- Full-spectrum options eliminate bulb swapping
T8 Versatility
- Wider fixture compatibility
- Easy retrofitting in existing setups
- Balanced cost-to-performance ratio
CFL Convenience
- Standard socket compatibility
- Ideal for small-space gardening
- 13-42W options for targeted lighting
Differences in spectrum capabilities can vary significantly based on the types of lights you use. While T5 bulbs can provide specific horticultural spectrums not available on T8 or CFL bulbs, some recent T5 bulb options actually have a combination of blue and red wavelengths, which support the full growth cycle without requiring fixture replacement. I have successfully used T5s for the flowering cycle, but not any other type of light.
Energy use varies by type. T5s provide the most output per watt of energy. T8s are moderately efficient. CFLs are not as efficient unless they are used in a supplemental capacity. The sized readings in my electric bills show an approximate 25% savings when comparing T5s to T8s. Consider the system's long-term costs, not just the initial cost of the system itself.
The physical size and shape affect installation possibilities. With its low profile, the T5 takes up significantly less space, allowing you to space the fixtures closer together. T8 requires more space and distance between fixtures. CFLs can sneak into tight spaces and corners. My vertical farm uses T5 lighting because it allows me to maximize my space. Just be sure to measure your physical area before deciding which type of bulbs to use.
Read the full article: Fluorescent Grow Lights: Expert Guide
