GoodBulb F21T5/835 21W Fluorescent Light Bulb: Legacy Neutral White Lighting
34-inch T5 Fluorescent Light Bulb with a miniature bi-pin G5 base. Emitting 2,100 lumens at 3500 Kelvin Neutral White, this slim, high-efficiency tube delivers clean, balanced light—perfect for commercial offices, schools, medical facilities, and residential applications. With a 36,000-hour rated life, it’s designed for steady, low-maintenance performance in high-use fixtures.

Why 3500K Neutral White?
The 3500K spectrum is the perfect middle ground between warm and cool, offering clarity without harshness—ideal for both productivity and comfort.

✔ Offices & Classrooms – Promotes focus with a clean, welcoming tone.
✔ Retail & Reception Areas – Enhances visibility while maintaining a pleasant atmosphere.
✔ Residential Utility Spaces – Perfect for kitchens, laundry rooms, and task lighting.

Slim Tube. Strong Performance.

✔ 2,100 Lumens of Bright Output – Illuminates smaller spaces with ease.
✔ 36,000-Hour Rated Life – Reduces replacement cycles and labor costs.
✔ T5 Narrow Profile – Fits modern, space-saving fixtures.
✔ Miniature Bi-Pin G5 Base – Standard connection for 34-inch T5 systems.

Fluorescent Efficiency Was a Leap Forward—LED Is a Game-Changer
The F21T5/835 has been a reliable choice, but LEDs now offer the same great light with far greater efficiency, durability, and ease of use.

Why Upgrade to LED?

✔ Up to 86% Energy Savings – Save significantly over time.
✔ Instant-On Illumination – No delay, no flicker, just clean light.
✔ Lasts 5–10X Longer – Reduce replacements and maintenance headaches.
✔ Mercury-Free – Safer for the environment and easier to dispose of.
✔ Ballast-Free Options Available – Eliminate long-term ballast failures.

LED Retrofit Options – Designed for T5 Fixtures

🔹 Plug & Play LED (Type A) – Works with compatible ballasts for a fast upgrade.
🔹 Ballast Bypass LED (Type B) – Connects directly to line voltage—no ballast needed.
🔹 Hybrid LED (Type A+B) – Operates with or without a ballast for total flexibility.

Recycle Your Fluorescents the Right Way with GoodBulb
Fluorescent tubes contain mercury and must be handled properly. We make it simple and safe:

✅ Prepaid Recycling Boxes – Ship your used bulbs directly to certified facilities.
✅ EPA-Compliant & Eco-Friendly – Avoid fines and environmental harm.
✅ Certificate of Recycling – Get documentation showing your bulbs were disposed of responsibly.

Step Into Better Lighting
Your F21T5/835 tubes got the job done—but LED is the better, brighter path forward.

Explore our LED T5 retrofit options today or talk to a GoodBulb specialist to find the perfect upgrade for your fixture. Let's light the way—smarter and cleaner.