Welcome to Marl International. Innovative solutions and global expertise in the LED industry for over 40 years.  It's in our DNA. MarlCOR - High quality UK manufactured LED indicators and lighting MarlCOR MarlDES - Design partners for excellence and efficient manufacturing solutions MarlDES OutdoorLEDs - Stylish, rugged exterior and landscape lighting OutdoorLEDs Optosource - Specialist knowledge and flexible, fast-reaction access to leading-edge LED technology Optosource