Looking at them on that link provided one up - frankly they look like the exact same light as the off-brands above.
Shocking as it may be - it kind of looks like Hella is re-branding whatever generic light these are.
My theory is that the actual manufacturer of the lights sent over a couple of bulk containers full of them. The rest of these companies are buying chunks of that shipment, putting them in a box with their own name on them - and out they go.
Just a theory. Look at the construction though - they all look like they came out of the same molds.
