It is bright, but light bar companies lie!
Light bars are advertised with their theoretical wattage, not their actual wattage. To avoid this from being common knowledge, most larger bars don't seem to publish their official amp draw. LumuLEDs wouldn't even answer it when I emailed them hahah. Mine has 96 LEDS that are 7 watts (672 watts in theory). That means, when the engine is running, it should pull 46 amps (672w divided by 14.5 volts). In real life it pulls roughly 30 amps which is about actual 435 watts. The most common 50" light bar is 288 watts (96 LEDS that are 3w) but in real life it will be more like 180-200 watts.
Either way, the KK has a 160 amp alternator from memory, so it's no problem.
Some people get a higher amps when they measure their bar, and assume that their bar is more efficient than others. Unlikely. In actual fact this is more likely due to the incorrect use of thin gauge wire (or too much wire) which increases the resistance and forces the light to pull more amps to compensate for the loss. The loss is heat of course, which is why thin wires melt.