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8 of 10 people found the following review helpful
on September 14, 2013
I have used the 300w LED Grow Light 6 Band 3w Veg Flower Leds Hydroponic Pro LED Grow Lamp Panel by Greatlux from Grow.Aquarium Manufacture for two days. This was long enough to unpack and test my two units. I found the shipping times better than advertised and packaging quality was adequate. I received both undamaged and in operating condition. Craftsmanship of the product is adequate. The two units I received were not as advertised.
The units received came with only four colors, not the six advertised. There are only two infrared, ten 660nm deep red, fourteen blue and all the rest are 630nm red. These units were received with no White and no UV.
This is a shame, but the units are certainly worth the 209 dollars I paid each. Replacing some of the 65% efficient PAR 630nm with more 80% efficient PAR 660nm and replacing a few more of the less efficient 630nm with some holistic white and UV will make these lights worth 300, easily.
I have filed a complaint, not as advertised. We will see what happens. Then I can rate customer service. Smile. In the worst case, I will still be happy with these units at the price point I got them.

UPDATE*
Quickly heard back from the seller with a reasonable explanation. The advertised description has been updated to reflect what is shipping now. The lights have been over plants (18") for two days and the plants are growing just as well as they were under other fine lights. A week will tell if these are the finest lights.

LAST UPDATE*
The lights have been over an established crop for over a week. The rate of growth and general appearance of health remains as good or a little better than the growth established with other fine lights. I will rate this light as a 5, based on price, performance and customer service response.

***Latest Update - two months after purchase.***
I see I got the counterfeit copies (according to label, my light from Grow.Aquarium Manufacture is not a Greatlux). I would feel ripped off, except I have gotten my money's worth so far. I started with two of these faux Greatlux at 50W per sq. ft., 8 sq ft total coverage. (figuring the 300 watt rating at a more realistic 200W.) Vegging was ok, but fruiting was crap. Removed one of the counterfeit 300W lights and added two 150W lights which had 40 3W 660nm deep red each, total 80 additional 660nm deep red and 10 more (20 total) 465nm blue, also. This left the wattage the same at 50W per sq ft, (figuring the two 150W lights at a more conservative 100W each). The additional 660nm deep red spectrum did the trick. This shows that the mostly red 630nm used in the 300W counterfeit Greatlux (and the real one for that matter) are really only 65% PAR efficient and a higher ratio of 660nm deep red 80% PAR efficient diodes is called for. I wonder how long the fans will last in my fake Greatlux, sold to me by Grow.Aquarium Manufacture ?? The 150W beauties are Grow Pro sold by Speed Shop.
~
Down grading to 4 because I got the counterfeit Greatlux. Otherwise good bargain. good light for the money. not a "stand alone" lighting solution. Needs additional deep red spectrum for good fruit.
~
A few general observations:
These 3W diodes (running at 66% power to greatly extend life - a common practice with all led lights) are very bright. I experienced bleaching at 18 inches. The recommendation I've seen of 3-4 foot distance is a good one. The central "flare" of the light (the area where all the individual diode cones of light overlap 100% - not the same as the advertised "coverage angle", which is typically advertised at the point the light is 50% dimmer than the central flare) is well dispersed at that distance, giving very even coverage.

The light's spectrum balance is not fully PAR efficient. The bulk (75%) of the diodes are 630nm red. By pairing one 300W Greatlux with two 150W GrowPro, covering 8 sq foot for 50W per sq ft (using conservative estimation of 200W + 100W + 100W actual wattage), I can achieve vigorous vegetative and fruiting growth because of a higher deep red 660nm to red 630nm ratio (50/50 is a better ratio of deep red to red). I don't see a lot of value to the orange red 610nm diodes. They are very PAR inefficient (45%). I would replace them with four 3000K white and one UV, for several reasons:
The white is good for the human eye and helps in viewing the plant when looking for problems. The white contains a large compliment of very deep blue, along with the complete light spectrum, all the way down to deep red. Since the PAR charts do show 45% efficiency throughout the complete color spectrum and an astonishing 95% at deep blue, these 3000K white diodes are a better choice than orange for giving the vegetation a "holistic" quality light (think of white as light "vitamin". Same thing goes for the UV - a holistic "vitamin" effect.
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Final opinion: Not a complete lighting solution as currently configured. Still a very good bargain and quite effective when paired with other lighting to provide a more complete spectrum. Every bit a 4 star product, considering the great bargain.
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This is a copy of the companies response:
Thank you for your message, we feel so sorry about that
Our lights is 6 band as follow, we promise it 6 band

This 6 band is the best ratio for your plants growing and flowering.
We feeo so sorry we are not update the amazon listing in time. we will update it now
Many customer said UV is not good for plants, and white color is useless.so we changed the ratio according to our customers demond,and the test was proved our 6 band is great.
~
This is the PAR watt efficiency breakdown of the light:
10 450nm 20Wx.95PAR=20PAR W
4 430nm 8Wx.95PAR=8PAR W
10 660nm 20Wx.8PAR=16PAR W
68 630n 136Wx.6PAR=82PAR W
6 610nm 12Wx.45PAR=5PAR W
2 730NM 4Wx.05PAR=0PAR W
Total PAR Watt Equivalent: 131PWE
PAR Efficiency: 131PWE/200W=66%
~
And the PAR watt efficiency of the 150W GrowPro lights from SpeedShop:
40 3watt Epistar 660nm red 80Wx.8PAR=64 PAR W
5 3watt bridgelux 455nm blue 10Wx.95PAR=10 PAR W
5 3watt orange. 10Wx.45PAR=5 PAR W
PAR Watt Equivalent: 89 PWE
PAR Efficiency: 79PWE/100W=79%
~
I plan on replacing the orange diodes with 3000K white diodes in both of these fixtures to give me more perfect led grow lights.
~
***********UPDATE***********
Ordered 3w leds from aliexpress. These component parts aren't available in US. Replaced half the 630nm red LEDS with 660nm dark red LEDs and one fourth of the 630's with white LEDs. The circuitry is the more expensive parallel style with resistors for each diode. Be sure to change out the resistor when you replace red diodes with white. The red diodes have different electrical characteristics from white diodes.
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4 of 4 people found the following review helpful
on August 30, 2013
I'm very happy with this led light, and more importantly so are my plants. I would recommend this light to anyone, and plan on getting another one soon, great for growing about 3 or 4 plants.
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3 of 3 people found the following review helpful
on October 29, 2013
I bought this about a month ago hoping for great results. However, sad to say I couldn't test the unit as it arrived with only half the lights working (which seems like common issue from other reviews). I emailed support ("Jack" a guy from China) and he said he would replaced the unit. I waited a few days with nothing progressing forward to getting me a new unit, I decided to return the light (California address) and asked Amazon get involved to get me my refund. I did get my money back (less the return shipping). It took about two weeks to get my refund. I do praise Amazon for getting me my refund.
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4 of 5 people found the following review helpful
on November 20, 2013
This light is junk. Total scam! Half of the leds do not work. They must know it's junk and do not care.
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1 of 1 people found the following review helpful
on November 6, 2013
This light was not as described. I already have one of the lights this seller describes. There is no comparison in the quality of the unit itself nor in the light it produces. For the same price the real light doubles or triples in brightness, makes no noise, and it's fans keep it cool and glitch free. I see that I wasted over $ 200 on this scam of a light, FUTURE CUSTOMERS SAVE YOUR MONEY!
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1 of 1 people found the following review helpful
on March 5, 2014
Well I'm just over 1 year into using this LED light, and 3 LEDs have already burned out... and now "Greatlux Technology" refuses to return emails about fixing it with the "3 year warranty" it came with... Avoid buying this light, and everything else for that matter, from the seller "Greatlux Technology", they might ship you what you order, but after that you are on your own... don't expect to get anything fixed under a so called warranty either, as they (Greatlux) will just delete your emails and continue to count your $...

I will see what Amazon can do for me... but seeing how I ordered this over a year ago, and it's not the easiest to get Amazon on the phone... I will probably be out of luck... I just hope this review saves someone else the $$, hassle, and a headache I'm having with this company.
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on June 7, 2014
The light worked pretty well for about 9 months then it started making a loud buzzing sound and soon after a row of diodes stopped working. I tried contacted the Greatlux Technology to see if they would honor the 3 year warranty but that was a fail, I emailed them a week ago and have still not received a reply. I would not recommend this light to anyone. Total rip off.
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on May 17, 2014
and it works great. Seems like folks who arent so lucky as to get a working one out of the box really get screwed trying to get a replacement, but my experience with this light has been great. All the leds fire still after months of use. The unit draws ~200w of power (the 300w is based upon total capacity for wattage for total leds, but it only uses 200w to extend life) and the light is more than enough to cover a 4x3 area. It glows brighter than the sun. I have used this with great success starting tomatoes indoors (where I live its too cold to have a proper tomato growing season outdoors), but the thing outperforms the sun in my area so its tempting just to grow them indoors 365, but the electrical cost is a bit too high for that to make sense for me.
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on November 19, 2013
My plants thrived with this light. Does not use tons of energy when it is plugged in also does not put off any heat to damage your plants. This light will cause your plants to grow very rapidly best if used in a grow tent. You cant complain when you can get a light of this quality for the money. You will be very please.
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on October 23, 2013
Not a very good light, I was pretty disappointed on the build and brightness of this light compared to my other lights.
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