This property determines the exposure compensation amount which applies a bias to the exposure level of the scene prior to the tonemap step. Defaults to 0.

• A value of +1 indicates twice as much exposure and -1 means half as much exposure.
• A value of 0 indicates no exposure compensation will be done.
• Range: -5 to 5

This property is replicated and can be set from scripts or Studio.

local Lighting = game:GetService("Lighting")
Lighting.ExposureCompensation = 5

You can use this property to adjust the exposure amount prior to the tonemap step to show more detail either in lighter or darker areas. This is needed as we move to a HDR pipeline.

When Lighting/Technology is set to Enum/Technology|Legacy, this property has no effect.

local Lighting = game:GetService("Lighting")

-- ExposureCompensation has no effect because Lighting’s Technology is Legacy
Lighting.Technology = Enum.Technology.Legacy
Lighting.ExposureCompensation = 5