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Noun: main beam headlamp
  1. A car headlamp that provides a bright, centre-weighted distribution of light with no particular control of light directed towards other road users' eyes; as such, it is only suitable for use when alone on the road, as the glare it produces will dazzle other drivers.
    - driving beam headlamp, full beam headlamp, high beam headlamp

Type of: headlamp, headlight