Planted Tank Guru
Join Date: Jul 2008
Location: East Lansing, MI, USA
To skip going number by number and ending up at - it depends, lets start at - it depends...
Also, just because something is possible to do - doesn't mean you should do it.
Some ballasts are rated for remote mounting. Some are not.
Of the ones that are not, some can be mounted a fair distance from the bulb, but you have to use larger gauge wire.
Some are not rated for remote mounting as they simply can't push enough current to work properly.
For a 9 watt setup, If by distance you mean behind the tank, 18 gauge wire should be fine. If you mean under the counter, I would advise a new plan involving a larger canopy and put the ballast under the canopy.
Now, as to over driving a 9 watt bulb, Why not just go with a 13, 14, or 26 watt bulb and ballast and stay safe.