Summary

Mounts a 12v bulb holder in a Sacla pesto jar to make an outside light.

Instructions

Holder push fits into Sacla pesto pasta jar and holds a G4 / 5.3 holder (10mm deep / 17mm diameter)

I'd recommend Fiery Chilli:
http://www.sacla.co.uk/products/pesto/fiery-chilli-pesto
(note, most of the pesto jars are the same, but some differ)

I used these bulb holders:
http://www.ebay.co.uk/itm/310933626949

and these bulbs:
http://www.ebay.co.uk/itm/161265645357

These jars then fit into some (take a jar to the shops with you) plastic gutter downpipes, some straight in the end of a pipe, some fit into fittings, but you can easily add some tape to pad if need be.

If you just push the pipe into soil then any water will drain away, if you concrete in perhaps drill a drain hole at base, or you could get carried away and seal the jars in with sealant, but then bulb changing is not so easy.

UPDATE
The pipe fittings that fit are the Terrain PVC-u 2" range; peice shown is 201.2.91 - 2.00''Sweep Bend (91 Deg) here:
http://www.polypipe.com/gulf/products/drainage/terrain-pvc-u-above-ground-drainage

and I've also added a bracket that can be screwed to a wall (or floor/ ceiling), provides a hole for cables and the pipe fittings above push on (you might have to tweak the size for your printer)

Pasta Jar and Gutter Pipe Light