Tubular shape, short and Compact plug-in base lamp in 2-tube technology, very economical, excellent luminous flux, excellent luminous efficacy, less than half as long as tubular fluorescent lamps, operation with battery, solar and mains current in conjunction with suitable electronic control gear, operation with commercially available ballasts and starters, suitable for operation with electronic and conventional ballasts, long service life, areas of application: Offices, public facilities, shops, supermarkets, hotels, restaurants, industry.