Just to comment on this thread, I am an engineer who works for Truck-Lite whose products have been mentioned on this interesting thread. We have been building LED products since 1991. Some comments that I would like to make are as follows:
1. Be careful when you do retrofits changing from incandescent lamps to LEDs as many lamps have parabolic reflectors where the filaments are at the focal point , when you add an aftermarket "LED bulb" you may in fact make the light dimmer thus wasting your time and money.
2. If your tractor is equiped with a flasher for the given application, a retrofit "LED bulb" in a warning lamp may cause the flasher to not work. Many flashers are "fixed load" flashers and when you install the LED, its current draw is so much lower that it increases the duty cycle (flash rate) of the flasher.
3. Like any electronic product, LED Products are continuing to drop in cost as the technology matures we are seeing improvements in lumens (light) per watt (power). This means that if LED's were too expensive before, wait a few months and reprice them. We are one of the world's top users of LED's, our products are made in America as we have three factories in Pennsylvania and one in New York State.
4. Truck-Lite products are available through all NAPA stores as well as other distribution. We have LED work lamps with trapazoid, flood and spot beam lamps. Information can be found at
www.truck-lite.com .
5. The lower current draw (1.2 amps) of the LED Work Lamps will work great for your compact utility tractor that generally has a small power source.
6. The fact that Truck-Lite uses a white color simular to the color temperature of the sun makes them able to improve your visibility. Wait until you see a well designed LED worklamp on a cold winter night, you will experience some wow factor.
If you light them up beside the incandescent work lamps, the incandescent lamps will look yellow.
Hope you all have a Merry Christmas!