Atthowe runs Reveal Nature, a company offering nature experiences and therapy including forest bathing and biofluorescence walks.
He first discovered the phenomenon through a TED talk he saw on YouTube.
“I was living in Indonesia at the time,” he said, adding: “I started experimenting, playing about with torches, and its been six to eight hours a night, every night, for the last three and half years now.”
He said the habitat and climate of sites like Wild Haweswater were “brilliant” and “under-appreciated”.
“The biofluorescense there is incredible,” he said, adding: “It’s a very special place.”
He has shared a selection of his photographs.