When we bought our house, the lighting fixtures in the ceiling came with R20 bulbs. I know nothing about lighting so I figured that only R20 bulbs are compatible with our fixtures. But I'm realizing that may not be the case.
So what are kinds of bulbs can I use that are interchangeable with R20 bulbs?
More specifically, I'm interested in Philips' Hue bulbs
Are any bulbs from that line compatible with lighting fixtures that accept R20 bulbs?