VIPARSPECTRAKS3000 LED Grow Light 320 watt with Samsung LM301H Diodes, Uniform PPFD Dimmable Daisy Chain 4 Bars Grow Lights for Indoor Plants Full Spectrum Plant Growing Lamps in 3x3 Grow Tent

I waited a long time before purchasing an LED light for horticulture. I was only moderately interested in the technology before these bar type LED grow lights came out, and they were all just the panel type. Oh, the panel types are nice, and they do indeed have new algorithms to help make the PAR footprint more uniform, but they still don't measure up to these bar style light fixtures in terms of uniform light distribution. I know this, as I have run a panel type and a bar type side by side as an experiment. With the bar style, all plants grew straight up toward the fixture. With the panel type, some of the outer plants curved toward the center, where the light was more intense. No question about it.Also, Vipar Spectra has such a good reputation I felt totally confident in purchasing the light. I have used this light twice now, and it really delivers the quality results for both vegetative and flowering growth phases. And it is energy efficient!Super easy to install and hang and effortless to operate. By far the best light I have ever used. The health of all plants grown under this light is magnificent.The only complaint I have about this light is regarding the dimmer switch. Since LED lighting is so intense, the common practice is to include dimmer switches with the lights, so that one can start out in the seedling stage at 25% intensity, go to 50% after a few weeks, up to 75% later in the vegetative phase, and all the way to 100% at the initiation of flowering. With some other brands and models of LED grow lights a dimmer switch is included which allows the user to raise and lower the intensity in small increments (basically a rotary potentiometer which allows even1% incremental adjustments). That is not the case with this light. The dimmer on this light only moves in 25% increments, so the user can only turn up the intensity in 25 percent stages.This isn't a deal breaker at all, because for one thing, this is an extraordinarily well made and high quality light. However, it still would be a huge improvement to include a rotary dimmer which allows custom settings. This is especially important during the young phases of plant life. With other dimmers you can dial in exactly the amount of intensity, making it less stressful on the plants each time you turn up the intensity. For example, you could start out at 20% instead of 25% for germination/sprouting, and then go up to 25% for the seedling stage. Next, instead of having to go all the way up to 50%, you could turn it up to say 40% after a week and a half, then up to maybe 60 percent, etc. etc. Over the course of a month, you could use the better dimmer to much more gradually adapt the plants to more intense light. With only 25 percent increments, you cannot do this, but the light is still awesome and you just have to be a bit more careful with your distance from the plants and with when you turn it up each time. And by the way, I spoke with a Vipar Spectra rep about this. She told me that they include the more adjustable dimmer in future models! And that's actually another reason to consider Vipar Spectra. Their customer services if off the charts awesome! Truly!A GREAT LIGHT!

Highly effective!This light is fantastic.My previous light came with my 3x3 tent (vivosun) which is the folding gimmicky light that has adjustable side panels that completely suck.This light is a solid choice for anyone using a 3x3 tent or a 5x5 (KS5000)Very bright, and I have no burn issues whatsoever.I like that the driver is detachable and can be stored outside of the tent which keeps the temps down.There’s a lot of nice lights out there and I put this light in the elite category.MarsHydro makes a nice light that is very similar, but this light just feels like quality and if you decide on one, you’ll see what I mean.

Love this light easy to install very light weight adjustable brightness is great and bright very seems to be a very well built light I've pulled two plant from under this light and will be buying more in the near future it's priced under other brands that are not as bright

Old school grower here I go back to HPS lights. I really liked my results the price was right the light penetrates perfectly in a 3x3 tent which made it a great value for my money. Completely adjustable and you can dim the light the right tools you can dial this in pretty easily and when dialed in you will get great yields with this light.

This light works really good .... I've had a bunch of different lights ..... Good build also

This is my second light as I am upgrading my 4x4 to a 5x10ft tent. These lights are awesome for home grow tents. They fit the bill and going home from a commercial grow with CO2 to my homegrow tents without CO2, these are perfect and fill the tent from corner to corner on a 4 x 4, but they will flower a 5 x 5 as I flower them on 75% power max and get a nice yield with 4x4 and 100% is overkill without co2 or a higher ceiling, 5x5 area/tent. These are awesome for the price.

In 2 months lost 40% intensity.*update*I'm currently getting this grow light repaired or replaced. I've been bouncing between various tests at their request, and now it's finally time to ship it back. They’ll only send the replacement once they receive the defective unit. For a product that’s critical to a grow cycle, the return process feels severely lacking—you're either without a light entirely or forced into buying a backup. This is definitely not the kind of experience I've had with items purchased through Amazon.

Great light, has nice increments for light strength. I am growing the best tomatoes on the block with this light.