We offer a wide range of actinic Super Diazo lamps in many lengths, wattage and diameters to cover many of your specialty application needs. SDI lamps emit radiation over the spectrum from 370 to 475 nm and have long been the standard in the printing industry. SDI is commonly known as TL/03, actinic. Super Diazo peaks at 420nm. These lamps are normally used in Silk Screening and Diazo Polymerization applications.