My parents have been to a garden show and seem some water features that
they liked - until they saw the price! My challenge now is to try to
make one :-)

The feature was bascially a large(ish) rock with water bubbling up through it.
Obtaining a rock is probably not a problem - garden centre will do at a
push - but to get one predrilled seems to make the price jump from about a
fiver to 45 quid!

Question one: How likely am I to be able to drill a hole in a rock. Something
like 15mm I guess. I have a decent SDS drill is this likely to just smash the
thing up? Should I be looking for a non-hammer solution (diamond?).

The other thing is that this "rock" had what the seller called "a special
halogen bulb" in the hole so that the water bubbled up over the bulb.
According to my dad this looked like a small bulb with heatshrink on with
just a couple of wires sticking out of the end. These were 25quid each...

Question two: Any ideas what this "special halogen bulb" might have been?
Maybe a super bright white LED would work? Dad wasn't convinced that it
was a real bulb at all.

I suppose one answer to drilling the hole is to make the rock - anyone
got any recipies for half realistic rock mixes? :-)

cheers,

Darren