Electronic transformers typically require a minimum load to turn on. Our unit is designed to power a single fixture if that is what the job requires. With that being said, it also has limitations. This transformer is designed for use with 1-15 Integral Lighting 12vAC LED fixtures and up to 50′ cable runs. For larger installations, you may consider using a magnetic transformer. If you’re uncertain, call our office at 800.861.1364 to discuss your project.