Could not be happier with the build quality and performance.

Started using this light in October. Excellent light, full coverage in my tent. Would recommend and would buy again.

I bought this light to to replace a 150w that I was running. I decided to finish up the plant that I was already growing with my new SonoFarm even though I only had a few weeks to go before harvest. So I made the switch. All I can say is wow! The bulk and the trichome production that the uv has added is impressive. On top of that this light runs really cool and has the capability of placing the driver outside the grow space for even cooler temps. Great product so far!

Ok so here I am switching to LED lighting and moving into a tent. I was using a 1000wt hps. for flower. I was skeptical,watched a few videos and took a chance. I picked the sf4000 for a 4×4 tent. Amazingly heat wasn't a problem. I decided to do a test run with one plant in a 20 gallon pot filt about 70% of the way with my soil mix I always use. Let me tell u my results with a plant half the height was crazy good. I totally recommend this light and my electric bill loved it. I became a believer. I'm actually thinking of getting the 450 to do a 5×5 tent.

I was skeptical to switch over from high pressure sodium lights in flower but this light made me a believer! I put one plant in a 29 gallon pot and let it do it's thing. The results where as if I was the utube guy giving classes on growing. My electric bill was hell of a lot lower and my yield on a plant half as tall was crazy good. Can't loose with this light and made in America!

It's a beast of a light .

I now have 3 of these lights. Sonofarm is an outstanding company, great service and great quality.

After growing with the light that I bought from sonofarm for a year I have been absolutely satisfied. But when the master control on my light had an issue I found out that sonofarm has the best customer service team that I have ever had the pleasure of dealing with. Thank you sonofarm for being so great. I will never use any other lighting company. You definitely have a customer for life.

I bought my first Sonofarm SF4000 light last summer. Amazing light, fantastic quality. So much so, I just bought two more. But why Sonofarm instead of Spider Farmer? Let's first start with the company.

Sonofarm is U.S. based, which is great for stateside customers. 24/7 support. Very responsive by email and Facebook Messenger. Fast, free, reliable shipping. Ordered on a Monday, received on a Wednesday. Even though I'm only a few states away, it still got to me crazy fast even though I only checked free 7-day shipping.

As for the light comparison between Sonofarm's SF4000 and Spider Farmer's SF4000, it's really no contest. They both use the exact same Samsung Diodes (LM301B) and the same Meanwell Drivers. They both show efficiency at 2.7 umol/J. The biggest differences are a thicker, sturdier heat sync (which is what holds the entire panel together) and the PPFD light intensity. PPFD might be the most important aspect when comparing grow lights. Sonofarm at 12"/18"/22" above canopy, at center of light, 2727/1714/1317. Spider Farmer for the same distances, 1880, 1314, 1065. if giving your plants more light intensity means something to you (and it should), then Sonofarm gives way more bang for the buck.

Lastly, the cost. Sonofarm is always less expensive than Spider Farmer, anywhere from $80-$100 less. Did I mention that Sonofarm has a 5-year warranty compared with 2 years for Spider Farmer? The choice cannot be more clear. Sonofarm is the best, and the big winner is you if you choose their lights.

i needed another grow light and researched them all and found that the sonofarm was the best quality and price. this sf 4000 is very bright and well built, pretty too.i already have a mars hydro but this light is better quality and less money so you cannot beat sonofarm if you need a really good growlight and shipping was very fast , recieved it the third day after ordering/i am well pleased with sonofarm,and they are americans with great customer service,unlike the chinese people. thank you sonofarm

Have bought 4 lights from them and are planning on buying more they just look good in my gorilla tents and out preform any other light I have had in the past. They are Made in American. Had the lights in 2 days from SC to MO each time I have bought lights This company is on point with everything. Thxs SonoFarms for a outstanding product.

I did weeks of research before purchasing this light. I compared this light to lights like the gavita 650w. This light out performs the competition on many aspects and is built extremely well. I definitely will be ordering more lights from you guys! It has Samsung lm301b diodes which is a nice and efficient diode. The power draw is about 645watts from the wall. The operating temperature is reasonable for the light and also you can remove the driver and mount it outside of your grow space. Thank you for making a quality affordable product for the indoor agricultural community! I would definitely recommend this light if you a grower on a budget or even if you can spend as much as you want.

I currently own 3 sonofarm lights and they all kill the game but this new ultra X is no joke my inner node stacking is so nice and tight. Can't wait to review again and share my end result.

Hands down I would recommend sonofarms grow lights to anyone trying to get big dense buds. This light is everything and more that they advertised, the par charts are exactly right and this light has slick look to it.. I'm getting a great 5x5 coverage on my flowers. And I received the light 2 days earlier than I was supposed to get it, the light was well boxed and a great pamphlet inside giving you high charts, recommended power usage , and a great overview of the company. You can't beat a 5-year warranty on a grow light. To me I got a great light and great peace of mind. Not to mention this is an American made light and the money will stay in our country. After the light has been running for a week I am further convinced that the discussion to go with Sonofarms Pro SF4000 was 100% the right choice. Thanks Sonofarm

High. New grower here and still learning .I Bought this light for one of my 4x4 tents to replace cheap light that came with the tent . It was the right move I went from small popcorn buds on a grow that was already in flower and they went to colas real quick(10 days) yield was way more than my first run with the other light. Ordered with the 7day free shipping and received it in 2 days. I am 100 % satisfied with their light. I just bought my second one for my other 4x4 tent and will be looking for another light for my 2x4x5 tent in the near future. Thxs SONOFarms for a great product...