Philips Color Kinetics is still one of the premier Architectural LED manufacturers in the world. Always updating their product line they have a wide range of fixtures for all types of architectural applications from cove lighting to exterior building washers.
An exiting recent release is their Intellipower system. The control system sends high-bandwidth control data (DMX) to fixtures over standard 2 + ground wiring, enabling the integration of intelligent LED lighting solutions into existing power systems. By leveraging existing electrical and physical infrastructures, IntelliPower technology lets you affordably install dynamic, digitally controllable LED lighting where it was never possible before. They have also developed a Site Assessment Tool that tests data signal quality for pre-installation qualification and post-installation troubleshooting so you can be confidant your existing infrastructure can adequately support the system.