A very efficient 12 V 100W quartz iodine lamp mounted in a well ventilated metal housing. Apertures 19 mm diameter are provided on two adjacent sides so that the lamp may be used either as an intense horizontal 'line' source, or end-on as a powerful 'point' source. The aperture not in use may be closed by a pivoted shutter equipped with a lock screw. The lamp house is mounted on a rod 160mm longx10mm diameter for supporting from an ordinary laboratory stand. Dimensions of lamp house 78x78x153mm. Supplied complete with 1mm of twin cable.