I have a trailer that uses 1157 bulbs for the tail/signal/brake lights. Each side uses one fixture with one dual filament bulb for all 3 functions. The fixture has a red lens as a cover.
I wanted to see if an 1157 LED equivalent would make the lights brighter. 1157 LED's come in either red or white, so I bought white since I already have a red lens. After I installed the bulbs I didn't see a significant increase in output, at least not in daylight, which is when I want the brightest light. I haven't compared the difference at night yet, but nighttime visibility has not been an issue. It's mainly when the sun shines on the rear of the trailer that the taillights are not that bright. They are bright enough to pass inspection, but even the inspector's have mentioned the lack of brightness.
That leads me to 2 questions:
Specific to my requirements, would red LED's behind a red lens be brighter?
If not, what is the purpose of red 1157 LED's? Places that sell them say that they are used for tail lights, but they don't say anything about the color of the lens they should be used with. I've never seen clear lenses for tail or brake lights, but maybe they exist? Maybe that explains the need for red 1157 LED's?