In the mid to late 1980's I had a passing dalliance with electronics and gained a number of qualifications in the field, all sadly forgotten, it just wasn't for me but at the time did it because I thought it was the future. I guess it is, but not for me, I had other passions to follow.
Getting to the point at the time LED's were incredibly basic , Tri coloured LED's were the latest tech. I even remember people debating if a blue LED would ever be made lmao.
Things have come along way since then and are still advancing but now that advancement is at a much faster rate and the applications are becoming more and more common place from high bay, flood lights, tv's and even head lights for motor vehicals, it was not that long ago that LED were only used for tail lights.
COB/Intergrated array Grow lights have only been around for just a few years, a relitively short time in the 8 or so years I have been following the progression of LED grow lights.
It is not that long ago that you would here the term "chinese knock off ufo's" and people saying you'll never grow good buds with LED as they were only disco lights and nothing would best HPS.
A vast majority of LED's are made in China of course some are better than others, but at least "chinese knock off" is no longer bandied around as the go to statement from people who have never had any experience with LED, as there are now many excellent grows demonstrating LED's can grow awesome buds.
Times & tech have changed and will keep changing.
We have all now seen LED can grow excellent buds and that is gonna keep getting better.
As TaNg mentioned we are witnessing the Evolution of this tech, some things will disappear, new things will come and sometimes they will also become hybrids.
This is a very exciting time for LED and LED growers and we are waiting with baited breath to see the new GN LED lights, but we also know that they too will become the tech of yesteryear as advancements are made.
Weather COB/Intergrated arrays remain a viable option for growing weed in the future will depend on weather the tech can be advanced to a suitable level to keep up with other LED advancements.
The one thing it does have in it's favor is it's easy buildability for light manufacturers - chip, driver , heat sink , fan (or no fan if it is passively cooled) & mains plug.
COB/Intergrated array may hang on in there for a while yet as a budget choice, where other new LED tech because it is cutting edge will cost more initially but it should also give superior performance and use less power.
What the future will bring, no one knows but it is gonna be damn exciting finding out.