Anyway i was thinking of building an update to this: https://www.instructables.com/id/Growing-Plants-With-LED-Lights/ when i got bored and thought i'd put together an electric bottle garden in old water bottle i had lying around.
Although this is kinda similar to my other instructable i figure its different enough to be worth posting. Its also not really an entirely sensible project, loads of light leaks out the sides (but it looks pretty) so its more of an LED assisted bottle garden, and it would of been a hell of a load easier to just cut up the bottle, but i liked the idea of doing it just through the neck.
Step 1: Building the Lighting Rig
To do this you'll need:
12 red LED's
1 blue LED
a square bit of plastic
thick copper wire
13 220ohm resistors
you should also have a fair bit of experience soldering and making electrical circuits.
Firstly solder 3 LED's along a piece of copper wire at about one inch intervals, making sure they are all soldered the same way around.
Step 2: Constructing the Lighting Rig 2
You should now have a strip of 3 LED's all connected the same way around, all with there own current limiting resistor, try attaching a 5v supply across the 2 lengths of copper wire and all the LED's should light up, if one doesn't try re soldering the joints.
Step 3: Constructing the Lighting Rig 3
Then get a small bit of plastic about an inch square and drill a pattern of hole in it as shown below.
The centre hole should be large enough to fit the blue LED through, and the pairs of holes around the edges should be the distance apart that the 2 pieces of copper wire from the LED strips are from each other.
Step 4: Constructing the Lighting Rig 4
You should now have something approximating the contraption in the second image below.
Now solder wires onto the end of each of the LED strips, and glue a blue LED with a series resistor into the centre hole of the piece of plastic. You should now have something approximating the 3rd image.
Step 5: Setting Up the Lighting Rig
Here's the slightly tricky part, first move the wires attached to the centre blue LED until it sits at what you guess to be a good height. Then adjust the wires attached to each trip of LED's until all the arms fold outwards and sit roughly level.
(I had mental images of my lighting rig gracefully unfurling, unfortunately it was damned difficult to get it all to sit right. The thinner the wire you attach to each arm, i imagine the easier it would be)
Its probably a good idea now to go around each of the pairs of wires and make sure they still work.
Now the lighting rig is all comfortable set up you'll want to find some way to keep it like this, tape should work just fine to hold the wire in place, but i drilled a load of holes through the bottle top and fed the wires through there and soldered them all to a small piece of strip board (see the 3rd image)
Step 6: Growing Plants.
Step 7: Plug In, Turn On, and Leave!
I've chosen to grow edible plants in mine so i'm going to have to cut up the bottle to get to them when they are done, but you should be able to grow near enough anything. you will probably have to air out the bottle a bit everyday to make sure the plants are getting enough CO2, or pipe some in from some brewing beer or wine (i cant remember how we did it when we where kids, but if you put the right mix of plants in you could seal off the bottle entirely and it would happily grow, I'm gonna have to give me mum a ring)
As an added bonus it also give off a fantastically eerie glow when you keep it on during the night.