Sadly not enough and then is always the issue of the quality and binning of their LEDs...Some BB led have UL list power supply, many if not all have CE mark.
The UL is for the powersupply, not the entire fixture.
I look at it this way... As logical simple math... If I'm looking for an efficient Fixture to replace MH Lighting what do I want?
-Power supply 85% Efficient Vs 92% Efficient.
-LEDs R5 or S2 Cree Vs R2 or Q5... 30-50% more efficient
-LDD Drivers... 97% Efficiency Vs maybe 85% efficiency on generic drivers.
-Optics... Optimized to reduce spill and 92%efficient or Generics at 85% Efficiency...
-Cooling and Thermodynamic Heat Dissipation...Hard to quantify the efficiency improvement of the individual LED but a huge factor in longevity
This is just a short list of why some LED Fixtures are much better than others. Yes cost is a factor and despite the huge tendency to save $ or go cheap, using quality components will save more in the long run... Look at the cheap drill bit that is used often... It is replaced often rather than never or occasionally... The same goes with pumps...
Our Sirius XTC has been very popular with those replacing 400 watt MH bulbs... If your on a budget and have a canopy our XTC DIY Kit has yet to have a single complaint from former Black Box users.
Why settle for less when DIY is so easy and in the unlikely event a powersupply, fan or driver fails you can easily replace it without replacing the whole fixture at much less cost... BB Fixtures are known for a 12-24month life expectancy... Rarely see one with a three year warranty like our Sirius XTC...
Bill