Ecotech Radion fixtures are not safety approved either. Perhaps their design is different but they did not get the approval to prove it passes. Many of the big name manufacturers do not get safety approval either when you look closely, perhaps only on the third party wall supply (ex. Kessil A80), or the wireless radio (Radion) but not safety on their products. Some just see a mark like CE and assume it is something it is not.
My understanding is under 48V DC does not require UL/ETL certification. It's kinda a loophole (not sure how true). A lot of black boxes just plug in a D cable - straight 115V and then an onboard driver rectifies it to the proper DC voltage. This entire fixture would then require UL listing instead of just the power supply.
I think the big thing here is that the big aquarium LED companies have a reputation to defend, while a lot of no name manufactures race to the bottom in terms of components, QC checks, etc. I've also seen a lot more COB LED devices for sale on
Amazon. These are super cheap -- you can even buy the LED chips and directly connect 115V or 230V wires to the chip. They get crazy hot and scare the crap out of me. You would need to mount them to a huge heatsink and epoxy coat them to prevent shorting. We don't use any at our current facility, but we have tested some. With the assembled fixtures, we've melted the lenses, fried the LED chips, fried the fans. I would not recommend.
Someone noted that a lot of weed growers must use the black box fixtures, but in Colorado, if you are doing a legal grow, you must use UL listed equipment or the fire department will make you change them out.
For many of our LED requirements, we purchase direct from an LED factory. This factory makes a ton of LEDs that are used in wet environments or even outdoors. Most of their LED modules are UL certified/listed (we have checked certificates) and are IP65 or IP66. They are significantly more expensive (not even including freight) than many of the black box fixtures you see on
Amazon per watt, but I certainly sleep better at night.