I've been running the Evitek for about a full season now, and I'm pretty happy with them.
On the advrider forum, look in the "equipment" category for a guy named Spiderman302.
He's an LED junkie and has provided a huge knowledge base on LED's. I'd hate to guess how much he has spent, both $$ and time,
keeping up with improvements. He even modified some and the manufacturer actually incorporated his design.
Since I put the Eviteks in, I haven't been keeping up with him, so by now there might be one that's even better.