A lamp, an optical module, a vehicle headlight, and a method for controlling a color tone of the same can be configured to ensure visibility of the surroundings of a vehicle on a wet road in rainy weather, in dense fog, and on a snowpacked road, for example. The lamp can include a first LED chip which emits blue light, a second LED chip which emits light with a different color from blue. A wavelength conversion layer can be provided in front of light emitting areas of the first and second LED chips in an emitting direction, and can include a wavelength conversion material. A driving control unit can be configured to drive and control the first and second LED chips. The optical module can be configured to include the lamp along with optical components, such as a reflector. A vehicle headlight can include a plurality of optical modules. The control unit can be configured to control the ratio of light from the first and second LED chips, thereby obtaining light of a desired color.