This Master AC Slave with Coiled Sync Cord is a handy little unit to have in your bag whether you use it as a main or slave light. With its 5800K daylight color balance, it's ideal for architectural and interior photographers who use them in standard fixtures in areas of high ambient daylight. Its wide angle of coverage makes it useful inside a softbox or bounced into an umbrella. The Master AC Slave is also a great alternative to hot lights in copy stands.