Haven't seen any in bloom yet myself but probably you are talking about Dierama.

Or Ixia?

or allium?

Also possibly brodaea/tritellia.

It doesn't grow from a bulb but the description of the upper parts is similar to Tradescantia virginiana, commonly called spiderwort.

With all the above guesses, a picture would sure help!

Can you post one?

Here is my unknown bulb among other flowers. Interesting, outside it very slender, almost fall to the ground, in water it stays strong:
{{gwi:1082723}}

Falling Geisha gal?

Ixia.

I have checked Ixia on internet, looks like my bulb is really Ixia.
Thanks to all of you