square pin to straight pin???

[richmondreefer]

Ok this might be a stupid question, but I thought Id ask before I burnt my house down or get a ride in the amblance. I have 2 tanks with 2 PC light fixtures that use the square four pin (gy10q) base. Can I some how change my fixture to the straight four pin (2g11)base.

 

If so, how much would it cost? And where can I get the female socket part ( not sure the exact name of that) or other hardware I need?

You may be asking yourself WHY? But I recently came across a great deal (free) on a bunch of bulbs with the straight pin arrangement, and since the bulbs aint cheap, and I am do to replace 4 of my bulbs...... figured i'd ask