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If you were asked what is the biggest cause of MOT failures in the UK, what would your answer be? Suspension? brakes? tyres? The truth is that lighting (albeit incorporating reflectors and electrical equipment) accounts for almost three and three quarter million MOT fails, virtually twice as many caused by tyres. These recent findings, from the AA, will be of particular interest to DIYers, because many lighting issues are relatively easy to rectify.
Types of lighting
While the science and Type Approval legislation that governs automotive lighting are convoluted topics, the range of light sources is fairly straightforward.
Filament bulb
While the pictured bulb type tends to be used in taillights and direction indicators, alternative designs
