The GoodBulb 4FT LED Sign Lamp is a high-efficiency 18W T8 replacement designed specifically for sign cabinets and outdoor box signs that use R17D base lamps. Engineered for ballast bypass / line-voltage operation, this tube eliminates ballast failures and ensures long-term, reliable illumination.

Delivering up to 2200 lumens of bright, uniform 4000K neutral white light, this LED sign tube boosts visibility, improves color clarity, and reduces maintenance costs. With an impressive 50,000-hour rated life, the GoodBulb LED Sign Tube is a cost-effective upgrade from traditional 32W fluorescent sign lamps, offering improved energy savings and superior durability.

Built for performance in commercial signage applications, this lamp is UL-listed, safe for dry locations, and operates in extreme temperatures from -22°F to 113°F, making it ideal for both indoor and outdoor sign enclosures.v

Applications

Ideal for commercial and industrial signage, including:

• Box signs

• Pylon signs

• Storefront signs

• Indoor and outdoor sign cabinets

• Menu boards

• Retail signage

• Wayfinding and directional signage