I've been extremely happy with my lights from
www.planelights.com
I have the 50W set, and they fit right into the standard Vans mounting brackets in the wingtips of my -7A. I've been into 100 foot wide runways at night and those lights light up the WHOLE runway. I've been asked by multiple towers and people on the ground what I have in the wingtips after they've seen me on final.
I made some good decisions and some bad decisions on non-stock items during my build. These landing lights are definitely one of the better non-stock decisions I made. Also, they replaced one of mine after it didn't light after install, so customer service gets a thumbs up from me as well.