Hydrofarm
T5 4' 6400K Bulb
Best high-output lighting for indoor gardeners seeking consistent plant growth.
Illuminate your space with the Hydrofarm T5 4' 6400K Bulb, a reliable and cost-effective lighting solution. Designed for long-term use, this bulb offers high output performance with a full daylight spectrum, ideal for promoting plant growth. It boasts an impressive lifespan of 20,000 hours and is fully compatible with all T5 fixtures, making it a versatile choice for various lighting needs. Available in different wattages and lumen outputs, it provides efficient and consistent illumination.
$41.95
Owner Satisfaction
4.5
/ 5
Category Rank
19
/ 77
#19 in Fluorescent Tubes
Price vs Category Average
-31%
Below average
Length
4
/ '
Who it's for
- Indoor gardeners focused on lush vegetative growth
- Growers managing small spaces with delicate plant varieties
- Budget-conscious hobbyists seeking reliable, long-lasting lighting solutions
Who should skip it
- Gardeners cultivating tall plants requiring deep light penetration
- Users prioritizing low long-term maintenance and energy costs
- People with limited storage or high-traffic growing areas
Performance breakdown
Photosynthetic Efficiency
The 6400K spectrum provides ideal light for robust vegetative plant growth.
Operational Longevity
A 20,000-hour lifespan minimizes the frequency of bulb replacements.
Lumen Output
High-output performance delivers consistent, bright illumination for demanding indoor environments.
Fixture Compatibility
Standard T5 sizing ensures seamless integration with existing lighting setups.
Energy Versatility
Dual-wattage options allow for flexible power consumption based on growth stages.
Build Reliability
Dependable construction offers consistent performance throughout the bulb's extended lifecycle.
Key Specs
Length
4'
Color Temperature
6400K
Rated Life
20,000 hours
Wattage Output (High)
54W
Luminous Flux (High)
5000 initial lumens
Wattage Output (Low)
24W
Luminous Flux (Low)
2000 initial lumens
Compatibility
T5 fixtures
Features
- High output (HO) light performance
- Full daylight 6400K spectrum
- Rated for 20,000 hours of life
- Compatible with all T5 fixtures
- Cost-effective replacement
- Long-term reliability
What customers say
The T5 4 foot 6400K bulb earns high praise for its exceptional reliability and strong value. Users consistently highlight its impressive longevity and stable light spectrum, confirming it as a dependable choice for plant growth cycles. This bulb delivers a high quality light source that performs exactly as expected, avoiding a premium price. Its dependable nature minimizes replacement needs and boosts efficiency for indoor gardeners. Reviewers agree this is a smart, essential purchase for maintaining healthy plant starts.
Know before you buy
Yes, the 6400K full daylight spectrum mimics natural sunlight, making it an excellent choice for vegetative growth and general plant development.
No, this bulb is not dimmable. It is designed for use in standard T5 fixtures and should be operated at full power.
This is a standard 4-foot T5 bulb. As long as your fixture is designed for T5 fluorescent tubes, this bulb will be compatible.
Yes, the bulb operates at two different levels depending on your fixture's ballast. It produces 5000 lumens at 54W for high-output needs and 2000 lumens at 24W for lower-intensity requirements.
The bulb is rated for 20,000 hours of life. This ensures long-term reliability and reduces the frequency of replacements for your indoor garden.
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Ask Hayley anything about this product before you decide.
Ready to buy?
$42