I’m about to purchase a new light. I’m curious why people would choose these over the Philzon Cob series?
That's a question and a half.
The bottom line comes down to how well does a light grow weed which comes to how much light output per watt of power and its spectrum.
The HLG products and most like it (there are a lot similar these days) use white diodes that give us a great all round spectrum for growing and they are some of the highest efficiency available , you can look up the lumens per watt. They also use some of the best drivers available and other components.
That means I can use say 30w per square foot to grow solid dank buds, where with a cheaper LED you could be looking at more like 40-50w per square foot.
Also that type of light is passively cooled, so the heatsinking is not minimal, there are no fans to fail and burn your light out and it should last over a decade.
Its also a damn sight nicer to be in your grow room when everything looks a natural colour and not a blueish or purplish hue, make diagnosing plant issues easier, though that's just an added bonus.
Have to say from the Philzons ive seen on amazon your getting a lot of light for the money in comparison to most cheap lights of similar quality but I would go with something using top end diodes any day.