They work best after dark and up to dawn. They will also work well in the daytime during the fall. I follow the basic rules of: " the lighter the conditions the lighter the plug - the darker the conditions, the darker the plug. For the 3-3/4 oz plugs, I generally use White Danny's, Yellow Danny's, Blue dannys, ALL Black Danny's and the specially made Brown plugs, which have been the best producer over the past few years.