I have several of these in red and amber. The light output isn't as good as competing incandescent side markers. The viewing angle is not as good as most incandescent side markers. The tiny size is a problem as would take very little dirt or snow to block. The plastic is thick enough that it should hold up to moderate abuse. I would not trust them to survive off road use. One advantage is that these use 68 mA at 12V. For use at nominal 24v I use 200 ohm 1 watt resistor in series.