"Ok, not wanting to burn out my light I tried it with 4 lithiums instead of all 8. The light is actually a 6v light, so you have two sets of 4. Now with 8 alkaline I got 1.1amps at 5.3v With 4 lithium I got 5.5 with 1.25 amps. That is 5.83 watts with alkaline and 6.875 watts with the 4 lithiums. I can imagine if I put 8 lithiums in ther the lamp would not last long. It would be really bright though."

According to Energizer the voltage will not be higher using both sets(barrels) than just one. The only difference would be the runtime. So if 4 lithiums give 5.5V/1.25A...then you'd get the same result using 8. If this is correct the 8 Alkalines that gave 5.3V/1.1A is the same as 4 Alkalines would give. ....so i can't understand why it should be dangerous to use lithiums.

How do you assume that the Surge is a 6V light? after all 4x1.2V = 4.8V