I shot Kirsty recently using glowsticks and glow-bracelets to create swirls of light. All you have to do is break the glass phial inside them to set them aglow. With the glowsticks that’s quite easy – just snap them – but with the bracelets they’re just too small and so you have to thump the little plastic beads with something and hope they don’t burst open. We got about half of them glowing, which was enough.