They perfectly clamp to every surface i've tried them on. They are very sturdy and clip on yo almost anything. Flexible and can be clipped anywhere. Clamp very strong and keeps light firm.

The timer is an awesome feature, it has 3 settings 3,6 and 9 hours. The only drawback is that the feature * are confusing. Output of heat from the lights is monitored to prevent and burning to your plants.

They also appear to be providing ample additional light to some smaller potted plants high up on a bakers rack as well. This light give great light to my plants and they are growing and blooming. Month of use at 12 hrs per day.

The timer works great and the plants are germinating like crazy. Hope it works to perk up some of my plants! Use for many different kinds of plants. There was nothing deceptive at all in the description.

Even on the brightest adjustment, the light is not enough. It's mid-winter, with no direct sunlight in my windows, so i was hoping to imitate the sun. However this product generates loud radio frequency interference (rfi) noise spikes every 40 khz.

The pl-1k easily out runs a 400 watt mh in one of my veg/mother plant/papa plant spaces. The dimmer is a must have. Dimming and daisy chaining just add more benefits.

The best light thus far that i have bought for my greenhouse. The light remains cool to the touch and since i lined the inside of my greenhouse with insulation that has a plastic cover, i am not afraid this could cause an accident. Growing some plants...  Read More

I'm no pro and i have several lights with fans (now retired), this is in a different ballpark. Far superior in every way to an earlier light purchased with similar intentions.

Not all diodes are the samsung lm301b. The dimmer function is a joke. Regret not spending the extra $100 for better quality and have the whole board of the samsunglm301b. This light works but this new model is * compared to the old one.