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The stock 194 bulb is 2 lumens; the stock 168 is three, and the LEDs I linked are all more than that.
Just so, how many lumens is a 921 bulb?
280 lumens
Keeping this in view, how many lumens is a car brake light?
400 lumens
The brightness of a light emitting diode (or anything else) is measured by luminous flux, which is the impact of the light on an eye, adjusted for different wavelengths. Luminous flux is measured by lumens, which corresponds to candelas of light, or luminous intensity, emitted over a solid angle. Its SI unit is lumens.