Highly Reliable Light Emitting Diode Light Source for Increased Public Safety. Energy & Maintenance Savings! Less than 5 watts (single-faced). Less than 8 watts (double-faced). Excellent Return On Inve$tment. Utility Rebates Available In Many Areas. UL Listed / UL Visibility Tested to NFPA Standards and to Higher EPA Visibility Guidelines. Emergency Flashing is Field Selectable.