Both Marc and Jasonn,
Do what nibbler says and find out what size (probably in amps) alternator you have.
It's a nominal 12V system, so use 12 when doing your calculations: Watts = 12 * Amps.
Depending on where you live, you may have to buy your lamps online, no big deal as they're pretty inexpensive and not really heavy to ship.
For example, there's a good selection at Tractor Supply:
http://tinyurl.com/244eq5
The larger 55W units will require a 5 Amp alternator (5A * 12V = 60W, so 5 to spare).
I didn't see a wattage rating on the round ones, but PAR36 bulbs can be purchased in multiple ratings.
Jason - Yes, you can put two, or 3, or 15 for that matter. Just watch to make sure that the sum of all the wattages doesn't exceed your rating.
If you do multiple lights,
make sure they are wired in parallel! Do not series (daisy chain) them. It won't hurt anything but they won't be very bright.
Personally, I'd go with one, and mount it on the right hand side as high as you can to eliminate the shadow from the chute.
You might even want to wire it up temporarily (or just use a powerful flashlight) and hold it in different places until you see one you can live with.
Who the hell let all the morning people run things?
