Sylvania 25303 F18T12/DSGN50/HO

Sylvania 25303 F18T12/DSGN50/HO – 25W T12 High Output (800mA) Rapid Start Fluorescent Lamp | 5000K | 850 Lumens | R17d Recessed Double Contact

850 lumens at 5000K Design 50 with CRI 90 – a 25W T12 High Output (800mA) Rapid Start fluorescent lamp designed for high output (800 mA) fixtures.

Quick Specs

• Brand: Sylvania
• Product Code / Model: 25303 / F18T12/DSGN50/HO
• Lamp Type: Fluorescent – T12 High Output (800mA) Rapid Start
• Starting Method: Rapid Start - High Output (800 mA)
• Wattage: 25W
• Base Type: R17d Recessed Double Contact
• Color Temperature: 5000K Design 50
• CRI: 90
• Initial Lumens: 850 lm (approx., after 100 hours of operation)
• Mean Lumens: 740 lm (measured at 40% of rated life)
• Rated Average Life: 9,000 hr at 3 hours per start
• Nominal Length: 18 in
• Maximum Overall Length (MOL): 15.91 in
• Bulb Diameter: 1.5 in (T12)

Product Overview

The Sylvania 25303 F18T12/DSGN50/HO is a 25W T12 High Output (800mA) Rapid Start fluorescent lamp delivering 850 initial lumens at 5000K Design 50. It is built for high output (800 mA) fixtures where lamp length, base type, ballast type, wattage, and color temperature must match the existing system.

This lamp is best suited for maintenance replacement in commercial, industrial, and institutional spaces. Before ordering, confirm the R17d Recessed Double Contact base, 25W wattage, and 5000K color temperature against your existing lamp or fixture label.

Why Choose This Product

• 850 initial lumens: Catalog rating after 100 hours of operation, with 740 mean lumens at 40% of rated life.
• 5000K Design 50: Helps match the existing light color across a facility.
• R17d Recessed Double Contact base: Designed for the correct T12 socket style; confirm before replacement.
• 9,000 hr rated average life: Rated at 3 hours per start; longer burn cycles increase lamp life.
• Sylvania quality: Suitable for professional lighting applications and facility maintenance.

Technical Specifications

Dimensions

Applications

• Maintenance and retrofit replacement in compatible high output (800 mA) fixtures
• Commercial, industrial, and institutional facilities and utility spaces
• Replacement for existing F18T12/DSGN50/HO lamps – confirm the lamp code on your current lamp

Compatibility & Replacement

Fixture type: Designed for high output (800 mA) fixtures using an R17d Recessed Double Contact base.

Ballast: Requires a high output (800 mA) rapid start ballast rated for this lamp. Always confirm the existing ballast label before ordering.

Starting temperature: Minimum starting temperature is a function of the ballast; consult the ballast manufacturer.

Before ordering, confirm:

• Existing lamp model matches F18T12/DSGN50/HO or an approved equivalent.
• Fixture socket matches R17d Recessed Double Contact.
• Wattage is 25W and the ballast is compatible.
• Color temperature is 5000K Design 50.
• Physical size is 18 in nominal length (15.91 in MOL) x 1.5 in diameter.

Ordering Information

• Brand: Sylvania
• Product Code / Model: 25303 / F18T12/DSGN50/HO
• Description: 25W T12 High Output (800mA) Rapid Start fluorescent lamp, 5000K Design 50, 850 lumens, R17d Recessed Double Contact base
• Specifications: Taken from the Sylvania linear fluorescent lamp catalog; specifications are subject to change without notice.

Safety & Handling Notes

• Disconnect power before installing or servicing.
• Use only in approved fixtures designed for compatible F18T12/DSGN50/HO lamps.
• Fluorescent lamps contain mercury and should be recycled or disposed of according to local regulations.
• Follow the fixture manufacturer's instructions and local electrical codes for installation.

For wholesale pricing, bulk availability, or help confirming the correct replacement lamp, contact ADL Supply at 1-800-235-3489.