The total power rating of the transformer (specified in watts) will determine how many lights can be used. A low voltage cable leads out through a hole drilled in the house wall or window frame and connects to the 12 volt or 24 volt lamps in your desired locations. The cable can be buried or left on the surface, but take care when using mowers or strimmers.

Positioning and fitting the lights
The simplest lights to install just have to be pushed into the ground with a spike. If they are the low-fitting types, line a hole with gravel and partly bury them. Aim the lights carefully: you want the object to be seen, not the source of the light. Uplighters make a dramatic statement but remember not to shine them towards neighbours' houses! Use them instead to shine on trees from below - use more than one light so the tree looks solid. Backlighting is good to silhouette a border against a wall or hedge.

Use downlighters, fitted in a tree or pole, to shine on lower plants or a water scene. This gives a soft and romantic effect. Illuminated water is particularly attractive.

Tip: Use coloured lights with care. They work best lighting moving water. For tips on installing a water feature in your garden, see Simple Water Features.

Warning: Mains lighting can be used but is costly, and using a qualified electrician is recommended as incorrect installation can be lethal. Low voltage lights are safer. Solar powered lights that require no wiring are also available but they are more expensive and not very powerful.