Universal B228PU115S50D Switch Dimming Electronic Ballast for 2 F28T5 Lamps, 120-277V, Programmed Rapid Start

Universal B228PU115S50D is a switch dimming electronic ballast designed for (2) F28T5 fluorescent lamps with secondary compatibility for (2) F35T5, (2) F21T5, and (2) F14T5 lamps. This ballast operates on 120-277V, features programmed rapid start, series lamp operation, and provides step dimming to 50% input power for energy-saving commercial lighting applications.

Quick Specs

• Brand: Universal Lighting Technologies
• Model: B228PU115S50D
• Product Type: Switch Dimming Electronic Ballast
• Starting Method: Programmed Rapid Start
• Lamp Operation: Series Lamp Operation
• Primary Lamp Type: (2) F28T5
• Secondary Lamp Types: (2) F35T5, (2) F21T5, (2) F14T5
• Input Voltage: 120-277 VAC, ±10%, 50/60Hz
• Dimming Range: Step dimming to 50% input power
• Ballast Factor: 1.15 at 100% power / 0.45 at 50% power
• Power Factor: >0.99 at 120V, up to >0.96 at 277V depending on lamp type
• Total Harmonic Distortion: <10% typical
• Crest Factor: <1.7
• Sound Rating: A
• Minimum Starting Temperature: 50°F (10°C)
• Maximum Case Temperature: 167°F (75°C)
• Mounting Length: 16.28" ± 0.01" center to center
• Overall Length: 16.88" ± 0.01"
• Width: 1.18" +0.03"/-0.02"
• Height: 1.00" +0.04"/-0.01"
• Weight: 1 lb
• Carton Quantity: 10 pieces
• Certification: cULus, Class P, Type 1 Outdoor, Type CC

Product Overview

The Universal B228PU115S50D ballast is engineered for reliable operation in commercial and institutional fluorescent lighting systems using two T5 lamps. It is optimized for (2) F28T5 lamps and also supports (2) F35T5, (2) F21T5, and (2) F14T5 lamps, making it a flexible replacement ballast for a range of linear fluorescent applications.

This ballast uses programmed rapid start technology, which helps extend lamp life in frequently switched environments by properly preheating lamp cathodes before ignition. With switch dimming to 50% input power, it offers an efficient two-level lighting solution ideal for energy management, occupancy-based control strategies, and reduced light output applications.

Key Features

• Step dimming capability: switches between full output and 50% input power for practical energy savings.
• Programmed rapid start: improves lamp starting performance and supports longer lamp life.
• Multi-voltage input: operates on 120-277V for broad commercial compatibility.
• Active power factor correction: supports high power factor performance for efficient operation.
• Low harmonic distortion: helps maintain power quality in building electrical systems.
• End-of-lamp-life shutdown circuitry: adds protection by shutting down when lamp failure is detected.
• Class P thermal protection: enhances ballast safety under abnormal operating conditions.
• Remote mounting capability: suitable for through-wiring in 8-foot fixtures.

Performance Data

Applications

The Universal B228PU115S50D is suitable for commercial fluorescent fixtures, office lighting, institutional buildings, educational facilities, industrial spaces, and other applications where two-lamp T5 fluorescent operation with stepped dimming control is required.

Compliance and Safety

• Meets ANSI C82.11
• Meets ANSI C62.41
• Meets FCC Part 18 Class A for EMI and RFI non-consumer limits
• cULus Listed
• Class P, Type 1 Outdoor
• Type CC
• No PCBs

Installation Notes

• S1 and S2 must be wired on the same phase.
• Ballast must be grounded in accordance with national and local electrical codes.
• Use of the ground terminal [G] is strongly recommended.
• Season new lamps by operating at full intensity for at least 100 hours before dimming.
• Remove power before replacing lamps.

Warranty

5-year limited warranty. Universal Lighting Technologies warrants that each electronic ballast will be free from defects in material or workmanship for a period of 5 years from date of manufacture when properly installed and operated under normal conditions of use.

Universal B228PU115S50D – Switch Dimming Electronic Ballast for (2) F28T5 Fluorescent Lamps | 120-277V | Programmed Rapid Start | 5-Year Warranty

Step dimming to 50% input power with active power factor correction – a high-efficiency electronic ballast for (2) F28T5, F35T5, F21T5, or F14T5 lamps, featuring programmed rapid start, end-of-life shutdown, and Class P thermal protection.

Quick Specs

• Brand: Universal Lighting Technologies
• Model: B228PU115S50D
• Ballast Type: Switch Dimming Electronic (Programmed Rapid Start)
• Input Voltage: 120–277V, ±10%, 50/60Hz
• Lamp Compatibility: (2) F28T5, (2) F35T5, (2) F21T5, or (2) F14T5 (series operation)
• Dimming Range: Step dimming to 50% input power
• Ballast Factor: 1.15 (100% power) / 0.45 (50% power)
• Power Factor: >0.99 (120V) / >0.95 (277V)
• Total Harmonic Distortion (THD): <10%
• Crest Factor: <1.7
• Sound Rating: A (quietest)
• Minimum Starting Temperature: 50°F (10°C)
• Maximum Case Temperature (tc): 167°F (75°C)
• Mounting Length: 16.28" ±0.01" (center to center)
• Overall Length: 16.88" ±0.01"
• Width: 1.18" +0.03"/-0.02"
• Height: 1.00" +0.04"/-0.01"
• Weight: 1 lb
• Carton Quantity: 10 pieces

Product Overview

The Universal B228PU115S50D is a high-performance switch dimming electronic ballast designed for (2) F28T5 fluorescent lamps, with secondary compatibility for F35T5, F21T5, and F14T5 lamps. Operating at 120–277V with programmed rapid start technology, this ballast delivers reliable ignition and extended lamp life in commercial lighting applications.

With step dimming to 50% input power, the B228PU115S50D provides two selectable light levels (100% and 50%), allowing energy savings while maintaining adequate illumination. Active power factor correction ensures >0.99 power factor at 120V with <10% THD, meeting ANSI C82.11 standards and FCC Part 18 Class A EMI/RFI limits.

Why Choose This Product

• Step dimming to 50%: Two selectable light levels for energy savings and application flexibility.
• Programmed rapid start: Extends lamp life by preheating cathodes before ignition – ideal for frequent switching applications.
• High power factor (>0.99 at 120V): Maximizes energy efficiency and meets utility rebate requirements.
• Low THD (<10%): Minimizes harmonic distortion in building electrical systems.
• End-of-lamp-life shutdown: Automatically detects failed lamps and shuts down for safety.
• 5-year warranty: Universal Lighting Technologies warrants against defects in material and workmanship.
• Class P thermal protection (Type 1 Outdoor): Auto-resetting thermal protection for safe operation.

Technical Specifications

Dimensions

Applications

• Commercial lighting – offices, schools, retail spaces
• Industrial lighting – warehouses, manufacturing facilities
• Institutional lighting – hospitals, government buildings
• 8ft fixtures with through-wiring capability

Compatibility & Replacement

Fixture type: This ballast is designed for 2-lamp T5 fluorescent fixtures using F28T5, F35T5, F21T5, or F14T5 lamps in series operation. Suitable for through-wiring in 8ft fixtures.

Wiring: Wire trap plug-in connectors are standard. S1 and S2 must be wired on the same phase. Ballast must be grounded in accordance with national and local electrical codes. Use of the ground terminal [G] is strongly recommended.

Before ordering, confirm:

• Lamp type: Verify your fixture uses F28T5, F35T5, F21T5, or F14T5 lamps (2 lamps per ballast).
• Input voltage: Verify supply voltage is 120–277V, ±10%, 50/60Hz.
• Dimming requirement: Confirm your control system supports step dimming to 50% power.
• Physical dimensions: Verify your fixture has adequate space for a ballast of 16.88" L x 1.18" W x 1.00" H.
• Temperature rating: Ensure fixture environment does not exceed 167°F (75°C) case temperature.
• Minimum starting temperature: Confirm ambient temperature is at least 50°F (10°C) for reliable starting.

Ordering Information

• Brand: Universal Lighting Technologies
• Model: B228PU115S50D
• Description: Switch dimming electronic ballast – (2) F28T5, 120-277V, step dimming to 50%
• Carton Quantity: 10 pieces
• Case quantities and bulk pricing available – contact ADL Supply for volume orders.

Compliance & Certifications

• ANSI C82.11 compliant
• ANSI C62.41 compliant (surge withstand)
• FCC Part 18 Class A (non-consumer limits for EMI/RFI)
• cULus listed – Class P, Type 1 Outdoor
• Type CC
• No PCBs

ADL Supply recommends confirming all applicable compliance data with the Universal Lighting Technologies official product data sheet prior to specification or installation.

Safety & Installation Notes

• Remove power before replacing lamps or servicing.
• Season new lamps: Operate at full intensity for at least 100 hours before dimming.
• Remote mounting: Suitable for through-wiring in 8ft fixtures. Other remote and tandem wiring applications not recommended.
• Phase wiring: S1 and S2 must be wired on the same phase.
• Grounding: Ballast must be grounded in accordance with national and local electrical codes. Use of the ground terminal [G] is strongly recommended.
• Maximum case temperature (tc): 167°F (75°C). Do not exceed.
• Minimum starting temperature: 50°F (10°C).
• Follow fixture manufacturer's instructions and local electrical codes for installation.