GoodBulb F21T5/841 21W Fluorescent Light Bulb: Legacy Cool White Clarity
34-inch T5 Fluorescent Light Bulb with a miniature bi-pin G5 base. Emitting 2,100 lumens at 4100 Kelvin Cool White, this slim-profile lamp delivers bright, clean light—ideal for task lighting, commercial spaces, healthcare environments, and utility fixtures. With a 36,000-hour rated life, it’s designed for consistent, long-term performance with minimal maintenance.

Why 4100K Cool White?
The 4100K color temperature delivers a bright, neutral tone that enhances focus and visibility—ideal for task-heavy and high-traffic environments.

✔ Offices & Classrooms – Promotes productivity with crisp, clear illumination.
✔ Medical & Laboratory Spaces – Provides accurate light for precision work.
✔ Workshops & Utility Rooms – Keeps workspaces well-lit without harsh glare.

High Output. Low Profile. Long Life.

✔ 2,100 Lumens of Bright Light – Efficiently lights up compact areas.
✔ 36,000-Hour Rated Life – Reduces downtime and replacement frequency.
✔ Slim T5 Form Factor – Fits sleek, modern fixtures with even light distribution.
✔ Miniature Bi-Pin G5 Base – Standard fit for 34-inch high-efficiency T5 systems.

Fluorescent Did the Job—LED Does It Better
F21T5/841 fluorescents helped define efficient lighting. Now, LED upgrades offer even better performance with less energy use, longer life, and reduced maintenance.

Why Make the Switch to LED?

✔ Up to 86% Energy Savings – Significantly lower your lighting costs.
✔ Instant-On Brightness – No warm-up time, no flickering.
✔ 5–10X Longer Lifespan – Fewer replacements, less hassle.
✔ Mercury-Free – Safer for people and the planet.
✔ No More Ballasts – LED bypass tubes eliminate common failure points.

LED Retrofit Options – Upgrade Made Easy

🔹 Plug & Play LED (Type A) – Installs into compatible ballasts—no wiring changes.
🔹 Ballast Bypass LED (Type B) – Connects directly to line voltage, eliminating ballast issues.
🔹 Hybrid LED (Type A+B) – Works with or without a ballast for full flexibility now and in the future.

Recycle Right with GoodBulb
Fluorescent tubes contain mercury and must be disposed of properly. We make it easy and responsible:

✅ Prepaid Recycling Boxes – Simply fill and ship to a certified recycling facility.
✅ EPA-Compliant & Hassle-Free – Stay safe and within regulation.
✅ Certificate of Recycling – Receive confirmation your bulbs were properly handled.

Time to Upgrade? We’ve Got You Covered
Your F21T5/841 tubes delivered performance—but LED takes it further. Brighter. Safer. Smarter.

Explore our LED T5 retrofit solutions today or contact a GoodBulb lighting expert to find the perfect upgrade. Let’s light the way forward—together.