I wanted to do a cob build , but when I priced everything I just don't have the capital @ the moment ;-)I like my old three watt lights also. They have ( and still do ) served me well. I may in the future gut them and use the housing for a COB chip. one Cree CXB 3590 puts out 10 times the PAR as all those three watt chips combined, and that's with it driven to less than 50% power!