I bought this ViparSpectra KS3000 off the strength of other youtuber reviews and I am absolutely baffled. Either they were sent different versions of this light that are clearly more powerful or I got a dud. I was expecting so much from this light and once I unboxed this light, the style and design made me expect nothing but the best. It has LM301H diodes, lots of them. OSRAM infrared and the spread of this bar light almost borders the tent perfectly which makes it a perfect candidate for perfect light distribution. However, this utterly disappoints according to measurements taken with the photone app which I have used in other light tests on this channel. After receiving this light, I checked the other reviews and it seems to be consistently poor performance. I dont understand how these youtubers were getting these readings when I have other lights that I cross referenced appropriately. This light is absolutely terrible based on my readings and I feel sick to my stomach because at one point, I was recommending it to people because of the “tests” done on youtube. Never again. I promise. Only things that I actually used moving forward. I WILL NOT RECOMMEND ANYTHING THAT I HAVE NOT TESTED MYSELF EVER AGAIN!!!!

Repeat 30x

Now I am not sponsored at all but companies send me free stuff all the time. I got this light for free but no contracts were signed and I blatantly tell all companies to send products but regardless of it being free, Im reviewing this as if I purchased it and factoring in price and being objective. With that said, this light sucks. ROYALLY. If this is how your light performed too, leave a comment. It appears other reviewers on Amazon feel the same.


  1. I am thoroughly dissapointed also purchased a KS2500 and presonally contacted Viparspectra and told them that the operating instructions are conclicting. I did exactly what they said and i’m throwing away plants again. This light is set at 30 inches on 25 percent.

    1. Yeah. It’s such a shame that people are saying this light is good. It’s terrible. Sorry you had to experience it but I warned people and everyone came and tried to slander me saying I have crap tools

  2. I have the XS4000 and it is doing quite well. I used Photone with just a piece of paper over the lens on free mode, not set to full spectrum LED. I get close to what is stated in the manual for PPFD.

    1. thats what they replaced my KS light with when I returned it, it has much better light intensity. They went backwards with the bar lights.

  3. Hey, 8-12 inches has been shown to be its ideal flowering range. The ks3000 can get really close to your plants without burning em, which is a bonus imho because space is so precious in a 3×3 vertically. It also fills out a 3×3 in its entirety with uniform coverage. Usually higher is better, but not with this one. Love your content, just thinking this light wasn’t reviewed at its best. Fwiw, I would’ve gone about things just like you did.

    1. 8-12 inches away is a sureshot way of foxtailing 90% of the strains out. Lighting follows exponential influence in intensity with distance.

      Any well versed grower will know that a reading at 10 inches away is fluff data.

      I never go closer to 12 inches and I have a video I have been chopping up with actual examples of plants that burn or foxtail from being too close.

      Thislight isnt terrible, youll be able to grow some decent larf or maybe buds when really close as long as the strain doesnt foxtail hard. But my issue is that influencers have steered people into buying this light with a bias tone due to sponsorships. New growers dont know what they dont know and apples to apples vs. other bar lights in the same price range from other companies, this falls to the absolute bottom of the list out of everything I tested.

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