I own two of those Cat-eye hl el135 you mention. The amount of light they output are hardly much. I don't use them much anymore except as loaner for rides with friends who wants a blinkie.

There's a lot of LED light option out there with Lumen ranging 100 to 1000 OTF lumens. What are your price range? You can get cheaper light anywhere from $30 to $200 for 100 lumen to 1000+ lumen. For better quality stuff, expect the price tag to double.

You also need to consider the power source. There are lights using common consumer battery to special LiIon battery. There's the question of internal or external battery and the runtime desire.