I used these to replace the stock #57 indicator bulbs with LED bulbs that were 3 times brighter. My "green" and "red" plastic lenses had darkened over the years to where you couldn't tell when the indicator lights were even on during the day. These LEDs are enough brighter that I can now tell when the signals are lit up even in daytime.
This in in garage so they look pretty bright. On the left is an LED bulb. On the Right is the old incandescent bulb. You can tell the LED is brighter but in the garage both look ok. Outside in bright sunlight the Incandescent bulb isn't bright enough to be seen but the LED is.