Make no mistake, these WILL hurt your eyes if you try to use them in a room you regularly occupy. These are designed to imitate bright, direct sunlight, and they do a fantastic job. I replaced my USB plant light sticks with the red and blue LEDs with these. This year, when I brought my potted tree indoors from the summer and put it under a light, rather than just stay alive in the cold months? It kept growing as if it were still outside in summer. I cannot recommend these enough, and have ordered
Lampada fantastica, luce potente simile a quella solare. Mi ha stupito!
Good product. I don't know how long does it works, wait and see