Specification 1. 130lm/w for options. 2. Daisy connection with very convenient replacement in 1minute. 3. 0-10v dimming, universal voltage: 120-277Vac . 4. Available with suspending installation and surface-mounted installation. 5. Wide application for: school, hospital, super market, office and warehouse. 6. 2ft, 4ft and 8ft dimensions for variety choices. 7. 5-year warranty.