Havells Factory
The tubes are washed in chemically purified water at a temperature of 65-75 degrees centigrade
(By Arnab Pratim Dutta (Reporter, Down to Earth)
Photographs by Meeta Ahlawat)

Havells Factory<
A coating of fluorescent powder prepared with a binder and purified water is then applied to the glass shells. The fluorescent powder is a combination of phosphor (containing calcium phosphate, aluminum oxide) and polyethylene oxide and dispersion agents
(By Arnab Pratim Dutta (Reporter, Down to Earth)
Photographs by Meeta Ahlawat)

Havells Factory
The filament is slipped inside the tubes
(By Arnab Pratim Dutta (Reporter, Down to Earth)
Photographs by Meeta Ahlawat)

Havells Factory
The tubes are vacuumed in an exhaust machine and mercury and argon are introduced into the tubes while the cathodes are heated
(By Arnab Pratim Dutta (Reporter, Down to Earth)
Photographs by Meeta Ahlawat)

Havells Factory
The CFLs are capped with a plastic base and sent for quality checking that involves grading of CFLs based on their luminescence
(By Arnab Pratim Dutta (Reporter, Down to Earth)
Photographs by Meeta Ahlawat)