Portable & temporary work lights
There is a large difference in use and therefore in construction between fixed lights and work lights.
Fixed lighting, mounted on poles, on walls or as a pendant light have much lower mechanical requirements to meet. These do not have to withstand drops, blows, or impacts with tools. At the same time, weight for work lighting is a much more important item.
A good example is the Ultra2. It is equipped with a battery, which would not be out of place in a medium-sized family car of more than 50Ah. But while the car battery is very heavy, the Ultra2 was engineered until the weight became only 5.5 kg. While, indeed, the lamp can withstand a fall is mechanically strong and is reliable when using.