I’ve tested all these below:
Mars Hydro (1000w, and 2500w, 120w and 260w actual)
Sonofarm (1000w and 4000w, 100w and 440w actual)
Viparspectra (1000w, ? Actual)
Unitfarm (1000w, 60w actual)
Canagrow (300w bulb, 60w actual)
Sansi LED (70w actual)
Bloom Plus (1000w, 80w actual)
And various burple lights I would never touch again lol.
In my opinion, the best is sonofarm. Same quality as Mars Hydro, only cheaper. Plus a 5 year warranty? Can’t beat it! Made with quality Samsung LM301B’s, plus genuine controllers.. It has fewer chips than the Mars, but run more power through each. A little lower power consumption overall, but very equivalent to Mars and runs around $100 less.
So sonofarm and Mars tie for output, but sonofarm sells them cheaper with a longer warranty. Viparspectra would be a good second place after the two tie, and bloom plus is not far behind (especially for the price). The brightness is definitely noticeable when comparing bloom plus to sonofarm, but quite similar to viparspectra. So due to the price point, I’d rather buy 2 bloom plus for the same price of 1 viparspectra lol.
Unit farm would come in next, but it has more of a harsh white light to it than a warm full spectrum. Still grows my trees well! I use it for newly grafted trees as it’s not so intense.
Sansi is my number 4, but when spending the money, I’d rather buy panels. Sansi sells their 70w for $70, and bloom plus panel is around $45. Bloom plus has much better coverage. Canagrow makes a really nice high powered bulb if you’re just looking for something small. $25 can’t beat that.
So anyway, sonofarm is my top (plus they’re all dimmable) I plan to buy more panels to replace the others as my trees grow and I feel like investing. In the pic below, left two panels are both sonofarm, on the right far back is my 2500w Mars, and the other two are both bloom plus. I’m using the viparspectra and other Mars over my rooted cuttings. All in all, my actual draw is around 1000w TOTAL using everything I have plus two root mats and 3 ventilation fans. If you look closely, you can see the difference in brightness of the chips. Sonofarm I feel takes the crown over all. I will note that the Mars has been used last winter so brightness does deteriorate overtime.