A hand-held light measuring device includes a device housing (G) with a bottom face incorporating a measuring window (7) through which a measurement optical path extends so that a measurement object can be measured when the device housing (G) is positioned with its bottom face on the measurement object. The measuring device has an integrated, displaceably mounted white reference tile, which can be moved into the measurement optical path and moved back out of it again. The white reference tile is disposed in an end region of an oblong support plate (10) on its side directed towards the housing interior. The support plate (10) is mounted so that it can move backwards and forwards between a parked position and an operating position, and the support plate (10) terminates the device housing (G) at its bottom face and is recessed into the device housing (G) in the parked position, and the support plate (10) is lifted out from the bottom face of the device housing (G) and moved in the longitudinal direction and covers the measuring window (7) by means of the end region incorporating the white reference tile in the operating position. The kinematics of the support plate (10) and white reference tile are simple in design/operation and the support plate and white reference tile can be moved easily and comfortably.