Interlux T5 Grow Bulb 4'

Interlux T5 Grow Bulb 4' in Two Spectrums for Veg and Flower

This is a 4 ft high-output fluorescent tube, the replacement lamp that goes back into a T5 fixture once the old tubes have dimmed. Each tube draws 54W, measures about 45.5 in end to end and seats on a standard G5 bi-pin base. It comes in two spectrums. The 6500K tube is a cool daylight blue that keeps seedlings, clones and veg plants short, with tight node spacing. The 3000K tube sits in the warm red range, which suits flowering plants and late-stage side lighting. LuxStar fixtures ship with Interlux tubes, and the 216W LuxStar 4-tube fixture runs four of them. Fluorescent tubes run cool, so growers typically hang them 6 to 12 in over clones and seedlings without scorching new leaves. That close hang is where T5 light earns its keep, because output falls off quickly as the gap grows. Plan on replacing the set together rather than one tube at a time. A fresh tube next to a worn one gives you an uneven canopy that is easy to miss by eye.

Picking T5 Grow Bulbs by Stage, and Where Each Spectrum Goes

Most propagation rooms run the cool tube from germination through veg, then leave the fixture on the clone rack when plants move to flower. Growers who finish small plants under fluorescents often mix the two, two cool and two warm in a four-lamp fixture, for a broader spectrum. These t5 grow bulbs also add useful side light along a tent wall the main fixture does not reach. Swap times are quick: twist the old tube out of the G5 sockets, seat the new one, and you are back on schedule. There is a limit worth stating plainly. A fluorescent tube is a low-intensity source, so it will not carry a dense flowering canopy the way a modern LED fixture does. Where it shines is the bench of cuttings, the seedling shelf and the mother plant corner, where cool, even light matters more than raw intensity. Because the tubes are standard size, they also drop into most other T5 HO fixtures of the same length and base. Check your ballast label first, since a fixture wired for standard-output tubes is not the same thing.

Key Features

• 6500K Veg Spectrum: Cool daylight blue keeps clones, seedlings and young veg plants compact with short internodes.
• 3000K Bloom Spectrum: Warm red-leaning light suits flowering plants and works as side lighting late in the cycle.
• 54W High-Output Tube: Matches the standard 4 ft T5 HO format, so the lamp drops into the fixture bay it was sized for.
• G5 Bi-Pin Base: Twist-in sockets make a full relamp a few minutes of work instead of a rewiring job.
• Matched to LuxStar Fixtures: Interlux sizes this tube as the replacement lamp for LuxStar fixtures, so fit and spectrum stay consistent.

Technical Specifications