A metal base has a mounting hole made in the wall for housing a light unit, and a reflection surface opposite to the hole for reflecting the light from the light unit to form a reflection lamp with high heat dissipation ability. The invention also includes a device for storing and transporting discrete articles, having at least one bag in which the discrete article can be received, wherein it comprises at least one insert, as described above, in the region of the bag taking up substantially the main load of the discrete article, said insert being movable relative to the bag and detachably secured to the bag. The sections of each series of interleaved sections generally face in a common direction so that images or parts of images displayed by the sections of a same series are viewable together, and the sections of different series face in different directions. The sink amplifier includes a first output circuit and a second output circuit, and a guard transistor is provided between the first output circuit and the second output circuit to prevent an output signal voltage of the first output circuit from exceeding an intermediate voltage. The electrical output signals are monitored as an indicator of analyte concentration or distribution in the stream flowing past the GMR sensor.