I know this thread is a couple of years old but I wanted to just say "thanks" for the info here. I grow my own vegetable seedlings, mostly peppers and tomatoes. I bought a Viparspectra a couple of years ago due to it's Meanwell driver. It's a little XS1000...my first toe-dip into purpose-built grow lights. I have a shelf of three 48" grow lights and some of those 3-panel "garage" 80w LED lights that I also use...mostly those are for carnivorous plants. Well, last year I decided to buy another Vipar XS1000 but didn't things came up and I never opened the box. It was an "upgraded" XS1000
Fast forward to this year... My wife heads up a women's jail ministry at our local county jail. Last October they decided to start a garden which the administrator was all for. Somehow or another little ol' me got
invited Shanghai'd to help with the garden. This project is on a Ramen noodle budget after a local bank promised to pay for hand tools but then basically reneged on their promise...leaving me and the wife out about $400 . My suddenly my need to grow vegetable seedlings more than tripled.
With the sudden need to grow my seedlings I opened up the extra Viparspectra XS1000 to realize I had been taken to the cleaners. It still had a Meanwell drive, but a smaller 1.1-amp....the old one had 2.0-amp. The number of LEDs are much less than the old XS1000 had. The heat-sink fins are merely slightly raised ribs on the plate...the old one had nice deep fins. The killer, though, was the DLI I ended up with....the "upgraded" XS1000 basically could only register *maybe* 66% of what the old XS1000 registered...the "upgraded" version was lots weaker.

It's my fault for opening it up so far past Amazon's return window and not being able to return it, but how the heck does someone sell the same "model" of something with *so many* differences from the original? Sheesh. The "upgrade", btw, was the ability to daisy chain the light...but not with my old "good" light.

I was considering another Viparspectra but after this "presto-change-o" between two lights of the same model number I said never again.
Anyhoo, I got to searching for 2x4 light and was looking at some of the Spider Farmer offerings...but I never could find any data on their drivers. Seems all I could find was that they had "Spider Farmers" printed on the drivers. *THEN* I found this thread.

I got to digging a little more about the HLG lights...really nice, solid lights that appear to be built just north of me in Tennessee. Great reviews, good specs. I did have to back off my quest for a 2x4 light (man, HLG has got some NICE lights) and settle for the HLG 100 R Spec. It sounds like this will be a better light my old Viparspectra so I'm going to hang those together to grow a 4' grow table I have. I'll use the other neutered Vipar for maybe some overflow.
Anyhow, thanks for the discussion...even a year or two later people (me!) are still benefiting from it!!!!