Lighting, Light Fixtures, Ceiling and Exhaust Fans - Something new for CFL ceiling lighting?

We're interested in switching over from incandescent to 27-32 watt dual 5100k or 5500k ceiling CFL fixtures in the various rooms of this modular house.

These CFL's specify that a fixture be open, though, so as not to have a heat buildup, I suppose.

The fixtures we have now are like this:
http://images.become.com/imageserver/s0/376930170-175-150-5-0/

clear ribbed bowl lights, but closed.

I've seen some semi-flush around, but they're always frosted, not clear.

The challenge is complicated by the fact that we have ceilings that slant upwards towards the peak of the house.

We'd rather not have to buy all new fixtures for the whole house, so I was wondering if there were clear ribbed glass plates that we could replace the bowls with, that would make open fixtures out of the existing ones, and would let as much of the light out, as possible, too?

But even if we replaced these, it needs to be with something inexpensive, and that allows as much light out as possible, short of just hanging some sockets with CFL bulbs in them, from the ceilings. ( ugly? )

Even if they had something like a clear glass plate with leafed patterns on it, and a hole in the middle to mount under the CFL's, it would be great, but I cant find anything like that.

Suggestions?

I think the developers need to come up with some new things, with CFL's in mind.

People are concerned about energy efficiency, getting the most light output they can, for the least electricity expense, and now these CFL's need open fixtures for cooling.

Do your CFL bulbs say not to use in enclosed fixtures or "enclosed and recessed fixtures"? I have several enclosed fixtures of the type you show, except with frosted instead of clear glass, and I've used two CFL's in each fixture for years with no issues. There's no safety issue with the fixture, as its only receiving a fraction of the heat it did with incandescent bulbs. The main concern may be shortened CFL life due to higher operating temperatures, but I haven't noticed my CFL's being short-lived at all.

Do your CFL bulbs say not to use in enclosed fixtures or "enclosed and recessed fixtures"? I have several enclosed fixtures of the type you show, except with frosted instead of clear glass, and I've used two CFL's in each fixture for years with no issues. There's no safety issue with the fixture, as its only receiving a fraction of the heat it did with incandescent bulbs. The main concern may be shortened CFL life due to higher operating temperatures, but I haven't noticed my CFL's being short-lived at all.

Ok, "not for use in totally enclosed recessed fixtures".

Not sure why that is, possibly heat buildup.

But there's still the issue of how much light gets out, and an open fixture would sure be better.

I doubt the light that gets out is any different that an incandescent bulb. The only thing that may happen is premature bulb failure.

I doubt the light that gets out is any different that an incandescent bulb. The only thing that may happen is premature bulb failure.

Oh I'd bet that the clear ribbed bowl cuts the light output by 40%. Those frosted ones probably cut it by 80%.