How to Light an Outdoor Tree for Christmas (The Right Way)

Lighting an outdoor tree at Christmas is a DIY job only up to about 3 metres; taller trees need proper light quantities, a tight trunk-and-branch wrap technique, and — above 5 metres — a cherry picker and trained team.

The "small tree, large tree" line

A typical mature oak, beech, plane, lime or magnolia across the South East is 8–15 metres tall. There is no safe DIY method for these trees.

How many lights you need

Trunk

100 lights per vertical metre

Major branch

200 lights per metre

Full canopy wrap

1,000 lights per metre of canopy diameter

A 5-metre tree wrapped trunk-only needs about 500 lights; trunk plus main branches needs 2,000+; a full canopy needs 5,000+. A typical "outdoor" supermarket strand runs only 100–200 lights — you'd need 25 boxes daisy-chained at 230V, which exceeds a safe household circuit load. Commercial-grade strands run hundreds of lights per low-voltage circuit with proper transformers for exactly this reason.

Wrapping the trunk: the technique

Don't spiral lights freely from the ground up — the spacing will drift and you'll run short two-thirds of the way up.

1. 1Start at the base, with the plug end at the bottom.
2. 2Wrap tightly around the trunk in a spiral — one full turn every 15–20cm of vertical climb.
3. 3Secure the wrap so it can't slip, without biting into the bark.
4. 4Decide before you start whether you're wrapping each branch or just the trunk — don't improvise halfway.
5. 5To wrap a branch, continue the wire out along it, spiral tightly, and return down the same path for the "every branch glowing" effect.

Lights for outdoor tree wrap

Cable

Rubber-jacketed, not PVC, built to survive years wound around bark

Rating

IP67 minimum

Voltage

Low voltage, 24V or 31V, for safety and run length

Mode

Steady on — twinkling looks cheap on a mature tree, steady looks majestic

The base of the tree

A common mistake is stopping the wrap where trunk meets ground, leaving a dark gap that swallows the effect. Extend the wrap a few centimetres below ground level if possible, or lay fairy lights under a ring of mulch around the base, so the tree appears to glow out of the earth.

Power

Weatherproof extension

Run from an indoor socket through an air brick or permanent outdoor outlet, secured along its route, never trailing across a lawn

Dedicated transformer

A sealed low-voltage transformer at the base, fed by a single concealed line — our standard approach

Timer or smart plug

Brings the tree on at dusk and off at midnight automatically

Safety

Even on a 3-metre tree, wrapping is physically demanding: the ladder needs constant repositioning around branches, both hands are needed for wrapping so someone must hold the ladder throughout, bark is uneven and slippery, and the job takes 4–8 hours in cold weather.

What we do for tree wraps

1. 1Site survey — measure trunk and branches, calculate strand requirement, plan the power route.
2. 2Cherry picker access on installation day, with a harnessed climber and ground spotter.
3. 3Wrap from canopy down, so cable feeds naturally to the base.
4. 4Secured so the wrap holds through winter winds without harming the tree.
5. 5Single sealed power feed.
6. 6Test, photograph, switch on.
7. 7Take-down in early January, then dry, store, and return in November.

A single mature tree takes us 4–6 hours from arrival to switch-on, and runs untouched every evening from late November to Twelfth Night.

The result

A street with one big lit tree feels different — neighbours stop, children point from car windows. It is, of all the things we do, the one homeowners are happiest with.

Have a tree that deserves to be lit properly? Request a tailored quote →

Related reading

• Roof, tree or facade: where should your Christmas lights go?
• Commercial-grade vs supermarket Christmas lights
• Christmas lights for big houses: a South East guide