589 400 watt bulb products are offered for sale by suppliers on Alibaba.com, of which led bulbs accounts for 14%, grow lights accounts for 4%, and flood lights accounts for 3%.
A wide variety of 400 watt bulb options are available to you, such as ac, dc and rechargeable battery pack.You can also choose from led, halogen bulb and incandescent bulb 400 watt bulb,as well as from residential, home, and office 400 watt bulb, and whether 400 watt bulb is manual button, remote, or sensor.