A headlight control apparatus (1) for performing control on a headlight device (7) which includes a pair of headlight units (3, 5) each including a light source (9) and an image forming section (16R, 16G, 16B) capable of forming an image and disposed in a light path of light from the light source to illuminate light (101, 105) for projecting the image onto a road surface, wherein the headlight control apparatus forms the image in the image forming section such that a first image (103) projected onto the road surface by one of the headlight units includes a second image (107) projected onto the road surface by the other headlight unit.

A light emitting module includes a reflector, a lens and a light source disposed in the reflector. The lens is disposed in front of the reflector to refract light forwards so that the illuminating area of the light emitting module is adjustable. The light emitting module is particularly suitable for head light of vehicles. The light emitting module has a high illuminating efficiency and prevent light from dazzling a driver's eyes.