I have been most disappointed in all the LED fixtures I have used. Most did not last a year (regardless of what you read about their longevity). Its a problem with the voltage step-down module, not the LED bulbs per se. All those that failed were actually the more expensive, higher watt fixtures, and they seem to have been poorly made (all come from China, naturally). Also, being very low voltage, they simply don't produce much light. One of my problems is that I am using the LED's in moisture situations and thus, they must be water-tight. If not for this, I could go with higher voltage/higher light output, but those devices must be fan-cooled. They can't get wet.
Time will tell whether my HO fixtures (tubes) are long-lasting. I have only had mine for a year. Thus far, I have seen no problems. Again, I am speaking from experience, not scientifically measuring anything.
