How is car window reflection measure?

my Florida State Law for window tinting mentions:

HOW DARK CAN WINDOW TINT BE IN FLORIDA?
Windshield
– Non-reflective tint is allowed along the top of the windshield above the manufacturer’s AS-1 line.
Front Side Windows
– Must allow more than 28% of light in.
Back Side Windows
– Must allow more than 15% of light in.
Rear Window
– Must allow more than 15% of light in.
HOW REFLECTIVE CAN THE TINT BE IN FLORIDA?
Front Side Windows
– Must not be more than 25% reflective.
Back Side Windows
– Must not be more than 25% reflective.
OTHER FLORIDA RULES AND REGULATIONS
Restricted Colors
– No colors of tint are explicitly banned.
Side Mirrors
– Dual side mirrors are required if back window is tinted.
Certificate Requirements
– Manufacturers of film do NOT need to certify the film they sell in the state.
Sticker Requirements
– The sticker to identify legal tinting is required on the inside of the driver’s side doorjamb.
Medical Exemption
– State allows medical exemptions for special tint. For more details about the specific terms of the exemption, consult your state law.
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what is meant by no more than 25$ reflection?
is it more reflective at 1% or more reflective at 99%?
it sounds like the higher the number the more reflective it is. i just want clarification