A curing apparatus is disclosed. The curing apparatus includes a flash lamp and a lamp housing for containing the flash lamp with the flash lamp's longitudinal axis in parallel with the direction of motion of a moving substrate irradiated by the flash lamp. The lamp housing is capable of attaching to a second lamp housing to form a concatenated lamp housing having a common reflector cavity. The second lamp housing also holds a second flash lamp with the second flash lamp's longitudinal axis in parallel with the direction of the moving substrate under the second flash lamp.