These are very handy. I do like that they can clip on the plant trays, that there is a timer on them, the 36 LED lights can be dimmed and the gooseneck can be turned, it is very flexible, but reliable for staying put. On cloudy days here the plants still receive growth light and when winter arrives there will still be enough light that my plants will not go dorment because they will still have enough light. Easy to use and a great onhand tool for greenhouse gardening.