Philips LEDtube INTERNAL STANDARD integrates a LED light source into a traditional fluorescent form factor. This product is the ideal solution for uplamping in general lighting applications: it meets basic lighting requirements, offers significant energy savings, and is environmentally friendly. Benefits:Reduced operational cost thanks to lower energy consumption.Lower maintenance cost thanks to 2-3 times longer lifetime than fluorescent lamps. Fastest and easiest way to upgrade existing luminaire to LED technology; completely safe product and installation process. Features:Replaces T12 and T8 fluorescent lamps, delivering significant energy savings.Simple rewiring of installation allows lamps to run directly off mains voltage.Long lifetime: 40,000 hours.No mercury.Upgrade version of 22/11 W, with 6-10% higher efficacy. Application: Retail. Industry. Offices, schools, hospitals and public areas.