Doesn't matter whether the light is artificial or not. If the wavelength is about 470 nm (blue), it will suppress melatonin. There's been done many experiments/

Doesn't matter whether the light is artificial or not. If the wavelength is about 470 nm (blue), it will suppress melatonin. There's been done many experiments/studies on this - here are a few: https://www.ncbi.nlm.nih.gov/pubmed/11763987 https://www.ncbi.nlm.nih.gov/pubmed/11763987 https://www.ncbi.nlm.nih.gov/pubmed/14962066 https://www.ncbi.nlm.nih.gov/pubmed/14962066 https://www.ncbi.nlm.nih.gov/pubmed/20463367 https://www.ncbi.nlm.nih.gov/pubmed/20463367 https://www.ncbi.nlm.nih.gov/pubmed/22850476 https://www.ncbi.nlm.nih.gov/pubmed/22850476 https://www.ncbi.nlm.nih.gov/pubmed/19444752 https://www.ncbi.nlm.nih.gov/pubmed/19444752 https://www.ncbi.nlm.nih.gov/pubmed/20652045 https://www.ncbi.nlm.nih.gov/pubmed/20652045