Use the LLF LED bulb for your 6" cans. They're more energy efficient, more environmentally friendly, can be dimmed and will last 50k hours. The color quality is great as well. They don't have a 4" version yet. So you're out of luck there. As for the CFL's. You'll most probably have to take out your dimmer if you use them. Even if you don't dim it, you can have some problems. The can you have is probably rated for at least a 100 watt bulb. A 40 watt fluorescent should be fine. Can't help you with #1 or 4 though. Sorry. Anyway, go with the LLF. It's pricey (try calling the places rather than ordering online, you might get a better price), but it's so worth it. They only have one product now- the LR6. But I tell you, it's fantastic. Here is a link that might be useful: LLF's website.

I found the most amazing bulbs to solve this problem as we went through it ourselves. They are the large round led filament bulbs instead of the edison shape -so I’m not sure how you would like that look. They are only 40 watt equivalent but the guy explained to me that they actually seem much brighter than the 60 watt equivalent Edison bulbs because of the amber glow the Edison’s give off. What the amazing thing about these bulbs is that they are bright white when turned on full and when dimmed they go down to a moody amber colour so it’s the best of both worlds for task lighting as well as mood lighting. They are Philips brand 40 W led round bulbs. I threw out the package yesterday or I would post a photo but I will try to post a pic of them in my pendant - if I can figure out how to post lol. Not sure if you can see the diff in colour when dimmed but it is significant in person!

Not sure what you are having trouble with I just googled up and down light outdoor lighting and dozens popped up. this is 3 BTW outdoor lighting is for 3 purpses to light the way to your home and also to highlight features and keep burglers away from the nicely lit areas.

I need three lights--one by the front door and one each on either side of the garage. I'd like something subdued where you can't see the bulb. I find our current fixture with its exposed bulbs just too bright as I'm driving up to our house at night; I feel like the house is on display. Just want enough low light to see for walking up to the house. And great looking fixtures, too, of course.