The manpages indicates an option "--exclude-file" but the binary doesn't recongnized it :
# man lsyncd | grep -C1 'exclude-file'
SYNOPSIS
lsyncd [--binary FILE] [--conf FILE] [--debug] [--delay SECS] [--dryrun] [--exclude-file FILE] [--logfile FILE] [--no-daemon] [--pidfile FILE] [--scarce] [--stubborn] [source] [target...]