Checkline AS4000 [AS-4020] Machine Vision Stroboscope, Flash Rate In Hz @ 600V: 20 Max The Checkline AS4000 series machine vision stroboscopes are designed for demanding applications that require high output, long life, and outstanding reliability. The AS4000 is rated for an output of 40 watts and is supplied in a rugged dust-proof metal enclosure. It is offered in a 20Hz, 60 Hz and 200 Hz versions as described below.