Thank you for inquiring about the Oversized Utility LED Light Bulb # T100/4000/5K/LEDHDRP. Our apologies for any misunderstanding. This LED Bulb is not intended as a Grow Light Bulb. The bulb has CCT of 5000K Daylight, but it is not intended to substitute for sunlight when using it on plants in an indoor setting. It is meant to light up large areas such as barns, garages, backyards and work areas that require a lot of light.
Thank you for the question. This bulb is 7in x 3in.