Okay, let’s calculate this. So Malcolm has 45 years of experience as an owner of Malder Lighting, which suggests a strong track record in the industry. His skills include interior design, lighting design, and project management, which are all in demand. Location is San Francisco, which is a hub for design and construction. Considering his extensive experience and skills, I would estimate his hourly rate to be around $125, which is slightly below average for an experienced interior designer in this location. This rate is also influenced by the fact that he is not a licensed architect or engineer, which can impact earning potential. However, his experience and skills in residential design and project management make him a valuable asset to clients.