Comparing LED brakelights (left lamp) to regular:
-020 ms
+020 ms
+060 ms
+100 ms
+140 ms
+180 ms
+220 ms
It is obvious that the center, halogen, lamp reacts quicker than the traditional lamp on the right. The assumption that the regular lamp is approx 1/10 slower than the LED seems to be about right.
From the photos it does seem like the LED is slightly weaker than the regular lamp. For the eye the I judge the apparent brightness to be approx the same. Also, for the eye, both lamps appear to be red when lit, not yellowish as registered by the camera. The LED is the type with 14 lamps as seen earlier. The stripes are from falling tiny leaves -- it was somewhat windy.
The recording was made at a frame rate of 40 ms, and I have just assumed the switch was closed between the 1st and 2nd frame. A high frequency capture camera is required for more accurate readings.