Just gor my new LED bulbs and batteries. Replaced a pair of 20 watt halogens with a 5 watt 10 degree beam and a 3x1watt 24degree beam from 1000bulbs.com. Replaced the SLA with a 4 ah nimh 13.2 volt battery pack from batteries plus.

The bulbs are longer then the halogen so I ended up cutting off the mr16 bases and soldereing the wires.

After charging the battery and hooking everything up to the light brain controller took them for a quick test. They seem pretty bright, about as bright as the 20 watt halogens but after an hour when the halogens would have dimmed quite a bit there wasn't any noticable dimming. The 5 watt spot doesn't seem as bright as the 3x1 bolb but is quite narrow and illuminates out to 150 feet pretty well.

The spec is serious about the not dimmable feature on the 3X1 watt bulb. It must have some type of voltage regulator in it as the light brain controller has no effect. THe 5 watt bulb is dimmed nicely.

After an hour the bulbs were warm, but nothing at all like the halogens furnace effect.

Finally the whole thing is so much lighter and takes so little room in the old SLA battery box I'm tempted to mount a light on the box.