The present invention relates to a densitometry device that can perform suitable densitometry with minimum required light amounts and can achieve space savings. Subsequently, sampling a signal from a disk by using only phase offset adjustment in the PLL timing recovery loop to sample read data from the disk after the disk clocked clocking acquires the lock. The pins of the receptacle are wired to appropriate hardware within the lamp such that the proper type of current is supplied to a bulb housed therein. The viewer controls the video clip during the session.