Promotional Starter Size Exposure Unit This exposure unit has been designed for developing up to A5 size APM photoresist materials. It has 4 superactinic 8W UV bulbs that are covered with a special crystal clear glass on one side and a high precision reflector plate on the other side to improve light transfer. Smooth contact between the artwork and film is achieved by a 22mm foam insert in the lid. The digital timer has a count down function and the unit is ideal for lower volume users as the maximum exposure area is 16cm x 25cm.