A lumen of 500 is good in a dark room, 1000 in normal lighting and 2000 where a room is lit with daylight. The carousel lumen is 1000, the ektagraphic 1300, the audioviewer 1300 and the ektapro 1300. A 100 watt light bulb generates about 1200 lumens. A lumen is a measure of brightness that a light source emits. LumensĪ slide projector’s light is measured in lumens. It used a 750 watt lamp, and was cooled by a blower. Slide size for this unit were 3.5 x 4 inchs. These were used more often in theaters and auditoriums. Not listed on the Kodak site are lantern slide projectors. It could also be connected to a computer for programming. A remote control was used to access any random slide and was equipped with two lamps. The Ektapro added a microprocessor for precision operation. This was used more by educators and professional presenters. The sounds could be synchronized with the slide changes. The audioviewer is an ektagraphic that has sound capabilities that were recorded on audio tape. The Ektagraphic was similar to a carousel with a brighter output.
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