First, set the camera securely on the tripod, make sure it’s really secure as the camera moving will ruin your shot.
Set up your camera's manual settings
Set your camera to manual exposure, a low ISO (200 will probably work fine) and set the aperture to around f/8. This should give you plenty of depth of field to make sure everything is in focus.
Cover up the LEDs
Next, you’ll need to prepare your light painting kit. Take your string of battery powered LED lights and use black electrical or gaffer tape to mask off all but a few of the LEDs near the end of the string.
Bundle the remaining LEDs
Using the tape, secure the remaining LEDs together to create a small bundle.
Add a coloured gel (optional)
If you want to make a coloured tree, you can add a gel (or sweet wrapper) to the LEDs so that the LEDs glow the colour of the gel.
Mount your LED tool
You’ll need a way of suspending the lights so that you can pull them shorter. (We used a boom pole in the video but any high bar or hook should work). Then with the lights still on (or, if you’re outside, using a torch) stand someone in the middle of the area you’ll be spinning the LED’s in and focus the camera. Using live view can help with this.