Funny that you mention Landscape lighting. I was at a party the other night talking to a landscape architect about some upcoming work and he asked me if we got into nightscaping\landscape lighting. We don't but he continued to tell me about this guy who came out to one of his sites that specializes in lighting. The guy showed up with some 12 volt backpack and placed temp lights all over the place and plugged them into his backpack to show the different effects that it had on his design. He said the guy was amazing and thats all he specialized in. So I say it's a great idea to fill a niche that your area may have. You are right in your assumption about targeting high end clients for this service. That's what our area is made up of so it works here, but am not sure of your area. Am not sure of his name, but if you want to contact him for advice in your area, I could get you the name.