Complete with a 25, 000 hour lifespan & featuring a five year guarantee, the Biard LED Exit Sign is perfect for use in a range of public places & will be sure to provide safe & reliable illumination at all times. Benefits: This bright LED light has an incredible 25, 000 hour life span meaning it is built to last. Application: Use in offices, schools, hospitals, shopping centres & car parks. Quality: CE & Ro SH certified. Did you know? The speed of light changes when traveling through different objects.