The product works well and performs as described. The spectrum seems more blue-white than Spider Farmer, but the tesults are similar. I would prefer this light over Spider Farmer because it is longer, not as wide, came with a dimmer, and produces more light. Spider Farmer advertised lights with dimmers while shipping stock without dimmer knobs. I switched to Mars because of that.
One negative is the poor/confusing attachment of the hanging hardware.

We love this light and so do our Tomato plants. They have doubled in size since we added the light. Lots of tomatoes growing also.

PPFD is pretty important for plants. Using my PPFD meter, I was able to verify the light put out 240 PPFD at 8" which is above what they claim.
using these to grow lettuce in a green house in winter.

Will update my review in a few months with a video.
Great value if you can get the 4ft 6 pack at $100 but still good at their $130.

Pros- these lights chain to one another so you only have to use one outlet to run all four lights which is a definite bonus they also have a solid on on switch which makes them usable with a smart plug which can be programmed where a lot of the LED sets that you find do not have a solid switch and cannot be used with a Smart plug on a program.
Cons - for the price I was expecting better light output. The plants under these lights don't seem to do as well as the ones under different lights and these are placed in a kitchen window so they have natural light to help boost them and they're still not doing as well as plants in other areas. The lights also get very hot much more so than other lights I use.
Overall I don't think I would buy these again the price is a bit high for the effectiveness of the lights.