Received the battlefield light mod from grumpy on Friday and got it installed on Saturday. Tried a few light placement combinations and bulbs. Ended up mounting to the posts near the optic sensors and used some yellow lights. I originally wanted to mount the lamp socket where the screws hold the optical sensors, but there wasn't enough clearance for that. However, you might be able to do so with a flexible LED, not 100% sure though. Here are before and after shots. The before shot I did alter the brightness as my camera made it appear brighter than it is to the naked eye. The after pic is unaltered.
As far as the mod goes, it obviously works just fine and don't have any complaints because I know what it was designed to do. If I could get the "ultimate" battlefield light mod, it would work pretty much the same, but wouldn't require the paddle to move before the lights come on. Small nit-pic I realize. But, when people that don't know the game play it they don't realize what is happening (the battle field starting up) they tend to not move the paddle and sometimes don't even see the ball drain past the paddle. Having the battlefield light up when it becomes active would really help with the context.
Overall, I have to give the mod a big thumbs-up because it does illuminate the battlefield in the really nice way!