Is there a law that only 3 pin Low Energy bulbs can be used in sheltered accommodation?

There is no specific law stating that only 3-pin low energy bulbs must be used in sheltered accommodation. However, regulations may exist regarding energy efficiency and safety standards that encourage the use of energy-efficient lighting. Local building codes or specific housing association policies may dictate the types of bulbs that can be used in such settings. It's best to consult local regulations or the housing provider for precise requirements.