Artificial lighting has revolutionized the way we live, but it also comes with hidden costs, particularly when it comes to the health impacts of blue light at night. This whitepaper explores the harmful effects of blue light on human health, the environment, and astronomical observations. It will discuss the science behind blue light exposure, its detrimental impacts on sleep and eye health, and the broader implications for light pollution and wildlife. Finally, this paper highlights the benefits of warm lighting and provides actionable recommendations to mitigate the risks of blue light exposure, both indoors and outdoors.