Signs for Thomas Built Bus Models

  • All signs are both Illuminated and Retroreflective
  • Customized shape for each bus model to maximize light output for greatest visibility
  • Available as a Thomas Built Buses Factory Installed Option

Two Types of Retrofit Kits:

  • 1. Replaces the standard decal
  • 2. Replaces the back-lit destination sign

All Retrofit Kits Come With:

  • Mounting frame
    • Includes template for fastener holes
  • Hardware
  • Electrical harnesses and fuses

Discover First Light’s Illuminated School Bus Sign

Simple Installation

Why choose the ISBS

It's available in ILLUMINATED and REFLECTIVE!

Grabs the attention of oncoming motorists before they are close to the school bus. The ISBS is its own light source; it does not need a car’s headlights to be visible
The words SCHOOL BUS are readable beyond 300 feet. The entire sign can be seen beyond 1,000 feet and is visible from all viewing angles – up to 180 degrees
The Illumination remains consistently bright and uniform in any weather condition, unlike reflective decals and existing back-lit signs
The ISBS eliminates the common industry complaints with back-lit signs – water intrusion, poor readability, and removes the need for large cut outs in the front/rear bulkheads
  • Specifications
  • Tested Standards
  • Serviceability
  • Q&A


Bus Model Part # Weight
ISBS – TBB C2 Front 100358 11.0 lbs
ISBS – TBB C2 Rear 100357 16.5 lbs
ISBS – TBB Minotour DRW Front & Rear, HDX/EFX Rear 100409 11.0 lbs
ISBS – TBB Minotour SRW,Front & Rear 100401 10.0 lbs
ISBS – TBB HDX/EFX Front 100973 10.0 lbs
  • Operating Temperature: -40°F to +185°F
  • Operating Voltage: 9 - 16 VDC
  • Amp Draw: 3.5 Amps per set
  • Electrical Connector: Delphi 2 Pin Make MP150
  • Standards: DOT-Compliant, IP67 Rated
Operating Temperature Min/Max ISO 16750-4
Storage Temperature Min/Max ISO 16750-4
Thermal Cycle (Operating) ISO 16750-4
Thermal Shock (Non-Operating) ISO 16750-4
Humidity ISO 16750-4
Frost SAE J1455
Salt spray SAE J1455
Chemical Exposure SAE J1455
Pressure Wash SAE J1455
Water Ingress Protection (IP Code) IEC 60529
Random Vibration ISO 61750-3
Mechanical Shock MIL-STD-202-213
Impact Test SAE J575
Handling Drop SAE J1455
Transit Drop SAE J1455
Accelerated UV Testing ASTM G155
Operational Voltage Range SAE J1455
Intermittent Power Specification ISO 16750-2
Jump Starting ISO 16750-2
Cold Cranking ISO 16750-2
Reverse Polarity ISO 16750-2
Load Dump SAE J1455
Conducted Transients SAE J1455
Bulk Current Injection / Conducted Immunity SAE J1113-4
Electrostatic Discharge (Powered/Unpowered) SAE J1113-13
Radiated Emissions SAE J1455
Radiated Immunity ISO 11452-2
  • The Illuminated School Bus Signs are maintenance free aside from cleaning
  • Ensure ammonia free products are used for cleaning (which includes some window cleaners). Use of ammonia products can cause hazing on the lens
  • In the event a sign needs to be removed, it takes less than five minutes to unscrew the sign and disconnect the electrical connection
  • Our Illuminated School Bus Sign is approved in multiple states and provinces. Please contact us to find out if it’s approved in your area.
  • Our Illuminated and Reflective School Bus Sign meets the minimum requirements of all state and province specs (with the exception of Delaware). Please contact us for more information.
  • An average retrofit installation is 2 hours to install both the front and rear sign. Installation time varies with exact bus model and equipped options.
  • 3 years mechanical
  • 5 years illumination
  • Visit our warranty for more information
  • A 10A fuse comes included with the retrofit installation kit.

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