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When determining how far apart your can lights should be, the rule of thumb is to divide the height of the ceiling by two. The resulting number is how far apart your lights should be. For example, if your ceiling is 10 feet high, your lights should have five feet between them. 

Depending on your preference, a 100W bulb could be too bright for a bedroom. Most people prefer softer, relaxing bedroom lighting using a lower wattage bulb, around 40W to 60W for incandescent or the equivalent in LED (around 450 to 800 lumens). For adjustable brightness, consider using dimmable bulbs or layered lighting with bedside lamps and overhead lights to create a comfortable and versatile lighting environment.

Generally speaking, you can install one recessed light for every 4 to 6 square feet. A 12x12 room is 144 square feet, which would need 24 to 36 recessed lights. The wattage you use for the light bulbs and the height of your ceilings can also impact the number of recessed lights you need for a 12x12 room.

Testing tools, such as Christmas light testers, non-contact proximity electrical testers, and multimeters, all simplify the process of testing Christmas lights. However, without one or more of those tools, testing Christmas lights the old-fashioned way only works sometimes. Without testing tools, the simplest testing method is visual inspection, which may or may not yield positive results.