This Ming's Mark 12V LED Bulb with 921 Base has a brightness of 330 Lumens. It also produces a 360-degree beam pattern. This cool white LED bulb operates with 12V or 24V DC and is ideal for RV, marine, auto and military vehicles. It's suitable for use with fluctuating power sources. Ming's Mark is an international trading company that also includes Green LongLife and Stylish Camping products. Ming's Mark and its subsidiaries are constantly working to develop environmentally friendly products that save customers money. Their ever-expanding product lines include camping chairs and tables, outdoor mats, lights and light bulbs.