We are planning to get canned lights in our living room. The ceiling has beams and so we’re trying to determine how many and where to position them. There are sixteen spaces for lights in the grid of beams. 12 of the spaces are rectangles and could potentially have two canned lights each. Do we go with 16 (one in each space) or as many as 28 (two in 12 of the spaces and one each in the four smaller spaces along the wall)? We are also in doubt about the size is the canned lights to use - 4 inch or 6 inch. Electricians have recommended as few as 8 and as many as 28. Thanks.