medium pressure mercury lamps emit discrete radiation at 290, 313, 365, 405, 436, 547 and 579 nm. Radiation below 290 nm are filtered out by the borosilicate envelop. Although this source is not intended to simulate daylight, it is used to induce the same photochemical processes as daylight. Mercury arc lamps provide a constant radiation level for a period of approx. 4000 hours.
sepap 12/24 is an affordable accelerated photoageing unit specially adapted to examine photodegradation mechanisms of polymeric formulations in laboratory conditions.