The built in timer delay in the HS550 hardwired photocell control unit prevents the flicker that occurs at dusk. Also, the HS550 also has a light shield that allows you to partially cover the photo cell.

This one is built for hardcore performance.

• Security Lighting Control
• Turns light on at dusk and off at dawn
• Built-in timer delay eliminates flicker
• Light shield allows you to partially cover photocell eye
• Mounts easily in 1/2" knockout
• 1900 VA ballast, 120V AC, 60hz
• 2000 watts max