These are Crompton make not some o secure make found on EBay. They are getting harder to find and then you’ll have to replace with LED type. They are dimmable.
The Crompton 60W 221mm Clear Double-Ended Tubular Lamp is a warm white light bulb designed for indoor use. With a colour temperature ranging from 2500 - 3000 K, these bulbs provide a cosy and warm lighting experience. Made of glass and using incandescent technology, these lamps have a beam angle of 180° or more, making them suitable for a variety of lighting applications. With an energy efficiency rating of G and a bulb lifespan of 1,000-1,999 hrs, these Crompton bulbs offer both quality and efficiency for your home lighting needs.