Joanie, If the cans are illuminating the countertop where there is no upper cabinet, they should be centered (front to back) above the counter. In most cases this will be about 12 or 13" from the wall. If there are uppers, then the cans should be centered over the edge of the counter or about 25" from the wall. You'll also want to install under cabinet lights wherever you have upper cabs. For better information than I can give you, post your question in the lighting forum. The folks over there are very knowledgeable and helpful.
editionk
willtv
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