I replaced all the 100-watt incandescent bulbs in my woodworking shop with the screw-in fluorescents, cost me less than $50 - that was back in the fall, I haven’t replaced one yet, don’t plan to for a very long time, and we’ve seen enough of a decline in our electrical bill to offset the cost of the “bulbs”. We also have them in all of our porch lights.
As others have suggested, I think you have a bad connection. I had similar symptoms with one in my kitchen a while back; eventually things got so bad that I had maintenance (I live in an apartment) check the connections. They were fixed and the bulb then worked fine.
Thanks All for the comments! Maybe it’s the lamp or wiring, I dunno. I’ll check into it. 
Yes, the light on a std CFC bulb is more white and less yellow.Some don’t like it, fair enough. But you can get natural spectrum CFC bulbs and other variations. Shop around.
I dumped a bunch of money into those things a couple or three years ago - Two of them lasted longer than a year, one in 12 died within a week, all put out far less light than expected, and none could be used as porch lights in the winter. Through attrition we are 100% incandescent again.
Yeah, and if you think normal CF bulbs are expensive, wait till you see how much a full spectrum one costs.
Local bargain store= .99 cents each and they work fine.
I have a couple of high-use places in my house. One in the basement (garden level, according to realtors), where, owing to the layout and the fact that at night I’d have to walk through the dark otherwise, I leave this particular fixture on most of the time.
It’s a fixture with two bulbs. I logged it, and they were burning out every 3-5 weeks, that is to say, I was lucky to get 5 weeks, more often 3. In March of 2006 I put in two compact fluorescent bulbs, and have not had to change them since. The bulbs cost $9 each, and they have paid for themselves if they go out tomorrow, but the deciding factor is that these bulbs are in a fixture that is kind of hard to manage.
The box said they would last 10 x as long as ordinary incandescents. They’ve already got that beat.