My experience with Leotek is different for each fixture.
For the GreenCobra series, they are fairly good. I haven’t seen any failures on the freeway here yet, since they were installed 4-5 years ago. None of the fixtures have noticeable lumen depreciation, although some have color shifted to a slightly bluish light. I have seen a couple of dayburners, but other than that the fixtures seem to be good quality. They are all replacements for 250w and 400w HPS, and have 89w and 183w LEDs, respectively.
For the E-Cobra series, my experience has been absolutely horrible. For fixtures that were installed 4 years ago, at the same time as GreenCobras and GE Evolves, they are dimmer than a 30 year old mercury vapor lamp. I would say that they easily lost 70-75 percent of their initial lumens over time. As for failures, I have seen quite a few, but most of then just dim out and don’t go fully EOL. I’ve seen about 30 dayburners, which isn’t an insane amount, but much more than with other fixtures. These fixtures are all 101w units, with plastic lenses, which was just a plain dumb idea. The lenses have become completely yellow, some almost brown, making the already dim light from these fixtures have an ugly, deep yellow color.
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I’ve always been interested in all kinds of lighting, mainly incandescent and HID, and especially all kinds of sodium lamps (HPS/LPS). I’ll tolerate LED but I’m not a fan of it.
I’m not proud to say that my city has Devolved to LED.