The next generation of bulkhead/oyster fixtures features an innovative modularity, allowing both light engine/driver replacement and retro-fitting into existing luminaires. Robust protection from ingress and impact, a useful amount of uplight to reduce glare, adjustable-power and adjustable CCT, plus a simple aesthetic which blends in to any space. Long-life components and improved luminous efficacy lend the Tio to situations where energy efficiency is a priority, and this can be further enhanced by integrating an optional Zhaga Book 20 microwave sensor for standalone automated control.