Walk into a room bathed in cozy, inviting light and you’ll feel instantly at ease. Walk into the same room buzzing with harsh fluorescents, and your teeth may start to grind. Why? In 2014, a Journal of Consumer Psychology study found that the more intense the lighting, the more affected and intense the participants’ emotions were — both positive and negative. The study included six experiments that examined the link between emotion and ambient brightness. Feelings of warmth increased when participants were exposed to bright light with hints of reddish hues. A sensation of angst increased when bluer light dominated. And the brighter the light, the more intense the participants’ emotions became. Both the intensity and the color of the light affected people’s moods.