AgroLED T5 LED Grow Light Bulbs
AgroLED produces the iSunlight series of T5 LED replacement bulbs designed as direct-fit upgrades for standard 4-foot T5 fluorescent fixtures. The iSunlight 41W T5 LED bulb replaces standard T5HO fluorescent tubes with an LED alternative that offers longer service life, lower heat output, and reduced energy consumption while maintaining the linear light distribution T5 fixtures are known for. The 5500K (White) color temperature provides a balanced full-spectrum output suited to propagation, vegetative growth, and general greenhouse lighting applications.
T5 LED vs. T5 Fluorescent
Standard T5 fluorescent bulbs have a service life of approximately 20,000-30,000 hours and require ballast replacement over time. AgroLED T5 LED replacements are rated for 50,000+ hours of service life, produce less heat per watt, and eliminate ballast maintenance in compatible bypass-wired fixtures. The LED format also produces more directional light -- less light scatter above the fixture and more directed toward the canopy. For propagation racks and seedling areas where T5 fixtures are standard, retrofitting with AgroLED iSunlight bulbs extends fixture life and reduces per-cycle operating cost.
Applications
AgroLED iSunlight T5 LED bulbs are used in propagation racks, clone rooms, seedling areas, under-canopy supplemental lighting, and small grow spaces where existing T5 fixture infrastructure is in place. The 5500K color temperature is appropriate for all pre-flowering growth stages. Browse all grow light bulbs or see propagation rack systems for T5-compatible setups. Fast shipping.
AgroLED FAQ
Are AgroLED T5 LED bulbs a direct replacement for T5 fluorescent tubes?
AgroLED iSunlight T5 LED bulbs are designed for installation in 4-foot T5 fixture housings, but most LED T5 replacements require a bypass wiring modification to the fixture -- removing or bypassing the existing ballast and wiring the fixture to run the LED tube directly from line voltage. This is a one-time modification that eliminates the ballast from the electrical circuit. Some LED T5 products are dual-mode and work with existing ballasts, but single-end and double-end bypass types are more common and efficient. Check the specific AgroLED product specification for wiring type before purchasing.
What does 5500K mean for plant growth?
Color temperature in Kelvin indicates the spectral character of a white light source. 5500K is a daylight-balanced white with a relatively balanced mix of blue and red wavelengths, slightly weighted toward blue. Blue-weighted light (4000-6500K) promotes compact vegetative growth, strong root development, and is well-suited to propagation and clone production. For flowering and fruiting stages, warmer color temperatures (2700-3000K) with more red are typically more effective. The AgroLED 5500K bulb is best matched to vegetative and propagation applications.
How far should T5 LED bulbs be from the plant canopy?
T5 LED bulbs are designed for close-range application -- typically 2-6 inches from the canopy for propagation and seedling work, where high light uniformity over a small area is the goal. At these distances, T5 LED output is adequate for clones and seedlings but insufficient for established vegetative growth requiring higher PPFD. As plants mature and move to larger grow areas, transition to higher-output LED fixtures appropriate for the growth stage. T5 fixtures work best when dedicated to propagation and early seedling phases within 6 inches of the light source.
