Brightest bulb for 4-inch can
I used to have a lone 6" can over my kitchen sink with a 65W incandescent flood. The light was perfect. My kitchen just got a facelift and I added four 4" cans and replaced the one over the sink with a 4", for a total of 5. The ambient light is great, but I want something brighter over the sink. Right now I have Philips 45W incandescent floods. I've tried Ecosmart 50W CFL flood and Halogena (both from HD) at about the same wattage. They all produce the same amount of light. The Ecosmart looks brighter in the ceiling, but the actual amount of downward light is no different. The lumens ratings are all over the map.
I haven't yet tried an LED light. The lights aren't dimmable, so that's not a factor. I'm wondering if there's anything out there that will produce something approaching 65W that will work in a 4" can. I don't care about the price. If it turns out this is a limitation of 4" cans, I may consider changing this one back to a 6".
Also, what's the difference between R20 and PAR20 bulbs? Can I use them interchangeably?