Replacement for GE 39978 - 21W, Cool White, Linear T5, Bipin Base

Replacing the GE 39978, this 21-watt T5 lamp provides reliable linear illumination. T5 tubes pack impressive output into a slender 5/8-inch profile. Equipped with a G5 miniature bi-pin base.

At 1974 lumens, light output is solid - appropriate for general ambient and task lighting. The 4100K cool white color temperature produces light that feels crisp and focused - ideal for task-oriented spaces. With 82 CRI, colors render naturally - meeting the standard expected in professional environments.

Key Features & Benefits

• 4100K Cool White: Crisp light that promotes focus and alertness.
• 1974 Lumen Output: Reliable brightness for the rated wattage.
• 82 CRI Rating: Colors appear natural and accurate.
• Flicker-Free Performance: Smooth illumination with compatible ballasts.
• G5 Miniature Bi-Pin Base: Direct fit for compatible fixtures.
• Brand New: Factory-fresh lamp with full rated life ahead.

Product Specifications

• MPN: 39978
• Wattage: 21 Watts
• Color Temperature: 4100K (Cool White)
• Lumens: 1974
• CRI: 82
• Base: G5
• Shape: T5
• Condition: Brand New

Common Applications

This linear fluorescent tube is commonly found in:

• Commercial Buildings
• Office Environments
• Retail Spaces
• Residential Applications

During the checkout process, you can choose from expedited services such as overnight delivery to standard ground shipping. We aim to ensure your order is delivered promptly and reliably, wherever you are.

All returns must be made within 30 days of purchase with the invoice. (After 30 days, Interlight credit only, Minimum 25% restocking fee, no returns after 60 days, special items order just for you are not returnable.)

At Interlight, your satisfaction is our priority. We offer a 30-day money-back guarantee on eligible products, provided they are returned in resalable condition with the original invoice.