and just drill tiny holes through my roof to fit the LED's though.
This would work nicely with 3mm, 5mm, and 8mm LEDs, the ones that look like a little bullet. Superflux LEDs would work with this also. However, you'd need quite a lot of these little fellows to light a room, hundreds I suppose.
If you want to use any of the more powerful LEDs, the ones that are sold as 1, 3, 5 watts or more, then you need a way to conduct waste heat away from the LED while it's running. If you don't it will tend to overheat, cook itself, and expire. :poof:
The 'star' effect you would get when the LED's were dimmed really low I'd imagine?
That is what they aimed for. That is what you get if you follow their instructions exactly. There is no reason you can't aim for something else, something brighter. One nice thing about the fibre optics is that you only have a tiny little dot visible on the ceiling, the lights themselves, LED or whatever they are, are up in the attic and you have all the room in the world to work with up there.
With the whole "dont play with 240V" thing - I was planning to use low voltage LED's
All LEDs are low voltage when you finally get down to the LED itself.
and just throw the 240V into a transformer that gave me a very low power output that I would then use for the LED's.
I think this is this bit that concerns us. We don't know what skills you have. Many of us here are in professions that involve lighting/making/fixing buildings and what not. Sometimes we see things. We are all in favor of doing projects like your ceiling, but we none of us want to encourage dodgy wiring. :shakehead
Do you have experience working with mains voltage? If not, could you perhaps have this part, the tie in to the building, done by someone who has already done it a thousand times and knows how to do it properly?
My current lights are 12v after coming through transformer.
I consider 12 volt DC as being very handy as a standard voltage to work with.
Alternately, I was thinking that I could use the 'lighting circuit' as is to wire it to a switch that just controlled a separate much lower voltage circuit that the lights were on so the 240 would just be used to turn them on/off.
You want a current regulated power supply, also known as an LED driver. They are basically small metal or plastic boxes. You put 240V AC in one end and get nicely managed low voltage DC out the other.
We talk about LEDs as being so and so many volts, lets say 12 volts DC for a particular string of them. That 12 volts will get you in the right neighborhood for powering them, but only roughly. The LEDs themselves are actually quite current sensitive. To run properly they want a fairly precise current level, and the power supply provides them with the correct one.
Do you perhaps have a closet or shelf or something you could use for practice before you do the whole room?
As for fastening wires to LED's - I presume this is just a case of soldering them on?
Yes, precisely.
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