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 Before replacement of a bulb, open its chain. 
Do not touch glass of a new bulb by fingers as the fat remaining on a bulb after a touch evaporates when the bulb heats up, steam accumulates on a reflector and darkens it. 
Always establish a bulb of the same type. Designations are put on a bulb socle. 
It is always recommended to have a set of spare bulbs in the car. 
A set of spare bulbs has to include, at least, bulbs of the following types necessary for safe driving: 
12 V/70/50W – for headlights of forward light 
12 V/21/5W – for forward indexes of turns and forward marker lights 
12 V/21W – for back indexes of turns 
12 V/3W – for back marker lights 
12 V/21/5W – a stoplight and headlights of tail light 
12 V/4W – bulbs of illumination of registration plate.   |