No 1600 lumen in a much broader area instead of all being focused in the center. You have to actually look at the LED setups as they appear...Several individual sources of light covering it's own area. All together they put out the same light power, but cover a lot more space.
I'm glad you brought up the "Diffused Fog" light thought. No it's nothing like that because those are single light sources that depend on a diffuser to spread the light which horribly disturbs the light path and you need a much more powerful light source to spread the light while the LED source is 6 individually focused sources.
I guess another analogy would be a single speaker with 1000 watts of power running in full range having to cover Bass, Mid-range and High's verses a 5 speaker setup that firing at you with the same 1000 watts of power. You still are using 1000 watts, but you are actually getting a substantial amount more total volume and coverage. Instead of having the one speaker with a very limited amount of speaker surface area you have 16 times more area making sound. Yamaha Sound did this several years back with a single box with 40 individual small speakers. It actually works really well.
I have built a single HID light bar with 2 sets (4 bulbs) that puts out an Incredible amount of light and I finally figured out the right formula/setup for the reflector. I did this two years ago when HID's were still way too expensive(grin). It actually worked great, but running 4 ballasts, relays and wiring just took up too much room and the amount of heat it put out was substantial.
These LED's are enclosed in an Aluminum housing/heatsink that gets rid of a lot of heat and provides good protection. The HID's are great lights if you use quality connections and protect the ballasts. Vibration is still a problem for some of them like the Halogen bulbs, but for the money and power savings they are a good buy.
I haven't proven it yet, but from what I've seen so far...I can use just 2 1600 Lumen LED's in place of 2 sets( 4 bulbs) of HID's because they light up the same amount of area. Now if the HID's were setup with two wide and two narrow it would probably be a little better.
One thing that I did think about was that if you had any on coming traffic at night it would blind the hell out of them for a longer period of time since the LED's have such a broad coverage. The light doesn't fall off quite as quick on the edges.