Depends on whether the room has a vaulted ceiling and how tall the ceiling is from the floor. Some people dont want to use eyeball trim on vaulted ceilings which adds to the formula of where to place the lights in that scenario. If the ceiling is flat, I try to space them about every 4 -5 feet apart. I find you can ever have to much light and a dimmer switch can always be added if its to bright.
yes, and that's what i recommend because the LED light comes with the trim and that one less thing you have to buy. understand this, the can is one part and then you have to buy the trim which is what you see from the living space, some owners buy a separate trim and then put an led bulb in the socket. I prefer to but the trim and LED bulb all in one piece and it save you one step and money. Nice part about LED, is low energy usage and the light fixture does not create of heat vs. using a halogen bulb. Check to see on the chosen trim if it is dimmable and then you can purchase a dimer switch to be used on this recessed can light circuit.
Only with a watertight halo with lens.
Release all three clips, grab heam of fixture ( cut paint if required) pull down and out as required.
Yes, use 100w> light bulb or less.
Good question. You have to get between the clip and can body from the inside ( remove light bulb and halo) take flathead screwdriver and pry clip out and away in a downward motion. Release all three clips, pull can fixture down and out .
Loose fill blown in insulation is acceptable. Only spray foam insulation is not to be in direct contact with recessed housings.