Reflective surface created by a glass coating
Smoke-colored lights have a slightly reflective or metallized surface. Depending on the angle of the light and the surroundings, the glass reflects light like a mirror, giving it a chrome-like It takes on a certain look.
Refraction of Light and Transparency
Smoked glass is not completely opaque, but rather lightly tinted. The combination of light refraction and reflection creates a metallic appearance.
Reflection is greater in the air than on a dark background
When the lamp is suspended in the air, it can reflect more ambient light. Against a dark background, the glass often appears darker, but in a bright environment, it reflects light more strongly and may appear silvery or chrome-like.
Lighting and Color Temperature
Cool light (e.g., daylight white) enhances the chrome-like effect. Warm light makes the color appear softer and more golden.
So the phenomenon is a combination of Reflection, Refraction, and Ambient Light. That's why smoke-colored glass lamps often look different depending on where they're hung and what light sources are nearby.