Cleveland Crop Sprayers Ltd are selling the TYRI Bluebeam1010 boom light.  They are by far the best on the market with 1 light being able to illuminate the spray for 20m in one direction.  2 lights will light up a 40m boom!  Yes there are cheaper lights on the market, but these are the best by far and cheaper imitations just dont cut it!  This light uses 4 LED's within the one unit!

you can see more information on the TYRI Bluebeam 1010 by clicking on the photo below