Alex Mustard / 2020VISION / Light-bulb sea squirts (Clavelina lepadiformis), a colonial filter feeding invertebrate, fluoresce green when photographed under deep blue light. Shetland Islands, Scotland, UK, June. Did you know? Se...

Alex Mustard / 2020VISION / Light-bulb sea squirts (Clavelina lepadiformis), a colonial filter feeding invertebrate, fluoresce orange when photographed under deep blue light. Shetland Islands, Scotland, UK, June. Did you know? L...

Alex Mustard / 2020VISION / Light-bulb sea squirts (Clavelina lepadiformis), a colonial filter feeding invertebrate, Shetland Islands, Scotland, UK, June

Philippe Clement / Photovoltaic solar panels on roof of house inside incandescent lamp / bulb against black background Digital composite

Philippe Clement / Sunflowers (Helianthus annuus) inside incandescent lamp / bulb against white background Digital composite

Sue Daly / Lightbulb seasquirts / tunicates (Clavelina lepadiformis) cluster on rock, Channel Isles, UK, July

Stephen Dalton / Swallow (Hirundo rustica) feeding chicks on nest build over light bulb, England, UK

Nick Upton / Sponge spider crab (Inachus sp.) covered in red sponge in a rockpool low on th shore alongside a group of Light bulb sea squirts (Clavellina lepadiformis), Helford River, Cornwall, UK, August.

Nick Upton / Group of Light bulb sea squirts (Clavelina lepadiformis) in rockpool low on the shore, Helford River, Cornwall, UK, August.

Nick Upton / Sponge spider crab (Inachus sp.) covered in red sponge in a low shore rockpool alongside other sponges and some Light bulb sea squirts (Clavellina lepadiformis), Helford River, Cornwall, UK, August.

Sue Daly / Light Bulb sea squirt (Clavelina lepadiformis) Channel Islands, UK July

Nick Turner / Light bulb recycling information sign at a recycling centre, Stroud, Gloucestershire, UK.

Alex Mustard / 2020VISION / Light-bulb sea squirts (Clavelina lepadiformis), a colonial filter feeding invertebrate, photographed under normal white light from a flashgun (left) and two examples photographed under blue light, on...

Sue Daly / Light Bulb Sea Squirt (Clavelina lepadiformis). Channel Islands, UK, July.

Sue Daly / Light Bulb Sea Squirt (Clavelina lepadiformis). Channel Islands, UK, June.

Sue Daly / Light Bulb Sea Squirt (Clavelina lepadiformis). Channel Islands, UK, June.

Sue Daly / Light Bulb Sea Squirt (Clavelina lepadiformis). Channel Islands, UK, June.

Philippe Clement / Trees in spring forest inside incandescent lamp / bulb against white background Digital composite

Stephen Dalton / Barn swallow (Hirundo rustica) feeding chicks at nest built on electric light bulb. England, UK.

Pete Oxford / Jigger Bulb, 2KW light bulb used in a squid jigging vessel to attract squid to the surface to be caught, Washed up on Elephant Beach, East Falkland, Falkland Islands

Piotr Naskrecki / Planthopper nymph showing waxy filaments, Atewa Range, Ghana

Kevin Schafer / Tweedy's Pussypaws (Lewisia tweedyi) close up showing stamens with pollen-covered anthers, Cascade Mountains, Washington

Albert Lleal / Nocturnal flying insects attracted to light bulb at night, Venezuela

Alan James / Light bulb tunicates {Clavelina lepadiformis} UK

Alan James / Light bulb tunicates {Clavelina lepadiformis} UK

Michael Hutchinson / Moorish Gecko {Tarentola mauritanica} on wall by outside light which provides warmth and attracts insect prey, Spain

Michael Hutchinson / Moorish Gecko {Tarentola mauritanica} on wall by outside light which provides warmth and attracts insect prey, Spain

Jim Brandenburg / Bamboo (Dendrocalamus sp) filament used in Edison's first light bulbs

Mitsuhiko Imamori / Suraka Silk Moth (Antherina suraka) flying around light bulb, Madagascar

Sue Daly / Light bulb sea squirts {Clavelina lepadiformis} Sark, Channel Is, UK