6,500 k Daylight High Output 8-Watt LED Fixture Lighting for Aquarium, 6-Inch

The sump for my reef tank is divided into thirds and I have chaeto algae in one section. I had been using an LED spotlight to light the chaeto but added this light. Wow, the chaeto growth is unbelievable and I will soon have to remove some of it for the first time in years. The thing is definitely waterproof as well - I had a pump malfunction and the entire unit ended up underwater, but absolutely no water got inside the housing and it looked like new after the water level went back down.The only drawback, as others have mentioned, is that the clamp won't work in a tank with a plastic rim. I have plexiglass separating the chaeto section from the rest of the sump, so I was able to clamp the light onto that, but this would not have worked on the plastic rim of the sump (which I built from a standard 20-gallon glass aquarium).

As a light powerful enough for my sump does the job pretty well to grow macro algae. My complain? Same like other reviews, the screw that holds the arm its plastic & no matter how much I try tightening it, the weight of the canopy bits the screw.

I needed a light upgrade for my Marineland Contour 3-gallon aquarium (added water lettuce, was worried about the crypts and anubias in the tank not getting enough light), and this fit the bill perfectly. The clamp is sturdy on the plastic wall of the tank and fits nicely in the slot in the plastic lid. I found the set screws to be plenty sturdy, but I would be extra careful not to strip the threads. The light doesn't have an on/off switch, but I use a timer plug so it doesn't bother me. Ever since adding the light last week, my water lettuce has multiplied like crazy!

Light worked great for about a month then the light changed from bright to dim. When I checked it only 4 led were working. Stay clear of this light unless you like buying a replacement every month.

This little light is bright enough to grow macro algae in my refugium but it is not designed to work with a standard tank rim. It should work fine if your refugium does not have a standard lip and is rimless. My refugium is made from a 29 gallon rimmed tank and this will not mount on it unless I cut a piece of the rim away which at this point I'm unwilling to do. Otherwise it works just fine.

I have a 20 gallon and this light is more than sufficient. In fact some days I feel it to bright and use a static cling tint on the tank lid and still get plenty of light. I'd put pics but the tank is not optimal right now as I write this so no go. Maybe later.

It was very good for a while. Seems well made and has decent output. Unfortunately, the LED's burned out at 2 years and 4 months. Not bad I guess but a LED light is supposed to have a much longer lifespan. It was on a surge strip the whole time and the problem is not the transformer, I put it on a bench power supply to check. it was not close to the water at all and had minimal exposure, just burned out.

Not sure how people are getting things to grow with this light. I put 4 different types of macro algae in a 15 gallon refugium and everything died with perfect water quality. I switched this light out with a power compact bulb and everything is back to normal. I now have it on a 10 gallon planted goldfish aquarium and the plants aren't growing and look washed out. On a positive note, the light doesn't put out any heat and does a good job of lighting the aquarium just doesn't seem to have a high enough PAR value for plants.