I am very new to using grow lights so I decided to buy this particular grow light because of other reviews !! WELL, WOW... this light measure just over 1ft on each side, about 2 inches thick, Ane the Power of these multicolored lights are Bright ! They add warmth and I am very excited to start with growing garden vegetable seeds through the winter and plant after the frost is gone ! I am so very happy with this grow lamp, and finger's crossed, I hope to have a great crop this year !!