How much can you focus a standard 5mm LED? (i.e how tight can you get the beam)
If you use the right lens and it is adjustable you CAN focus an led to a nice tight point. It will not be a laser, but and led just puts our light and light can be focused. A little distance in front of or behind the focus point and it won't be focused anymore. There are ways to make the beam almost linear but it still won't be a laser.
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So....you can get most of the light into a few strands of fibre optic cable?
Well, I didn't say anything about fiber optic cable but you could do that.
Use what lens?Can mirrors do the same effect?(ps if you can, please reply as fast as you can,im forgetfull)
No, LEDs are not lasers.