I never really thought about my rain light until we raced in the rain the other day and I couldn't tell if the cars in front of me where even still on the race track. I swapped my 2 bulb style rain light for a 14 LED $12 light from Amazon.
https://www.amazon.com/Maxxima-M4220...ima+brake+turn
WOW what a difference. If you don't have a LED rain light please consider one.