Abstract: Technologies are described for devices and methods to convert first wavelength electromagnetic waves to a second wavelength. The devices may comprise a light source to produce first electromagnetic waves of the first wavelength. The devices may comprise a reflector which may define an optical cavity around the light source and include a first and second end. The first end may be disposed around the light source. The reflector may reflect the first electromagnetic waves towards the second end. The devices may comprise a wavelength conversion component disposed at the second end which may absorb the first electromagnetic waves and emit second electromagnetic waves at the second wavelength. The devices may comprise a fixture housing disposed around the light source and the reflector. The devices may comprise a retaining component attachable to, and removable from, the fixture housing. The retaining component may secure the wavelength conversion component to the fixture housing.