Had problems from the start. The only way to know if the lamp is on is if the LED light is on. On first one we got, the LED wasn't lit so we sent it back and eventually got a replacement. The new LED did work, however, a month later we noticed the light was off.
No idea if the lamp is still on and to be honest, do not really want to go through all the hassle again with the shop.
Our fish tank water was green so we turned the aquarium lights off and ordered this product.It took so long for the first lamp to arrive and then be replaced that by then the water had cleared.
So, if anyone has problems with green water, I would suggest turning the lights off and waiting for a month to see if it clears on it's own. (a lot cheaper and saves on electricity!)We now have the aquarium lights on for a couple of hours a day and so far so good.
Putting this purchase down to experience!