LED tubes:
The working principles of fluorescent lamps determined their tubular structures. Lamp bases applied to filament lamps cannot be used on fluorescent tubes. However, fluorescent tubes were widely used, in spite of the oversized lamp body and noise coming from ballasts. Because fluorescent tubes have a most important advantage: energy saving. Designers continued to use the design concept of fluorescent tubes, and created LED tubes. However, this tubular structure has nothing to do with principles of LEDs, just a copy of the traditional design concept. The oldest fluorescent tubes are T10 tubes. In order to improve the lighting efficiency, designers then invented T8 fluorescent tubes. Until today, T5 and T4 tubes have been used in many places. According to the working principles of fluorescent lights, the longer and thinner the lamp body, the better the lighting effect. Thus diameters of tubes became smaller and smaller. However, it does not mean that this kind of design is also suitable for LED tubes. As a type of residential LED lights, LED tubes cannot work in high temperatures. Designers did not take this into account. From the oldest T10 LED tubes to T8 LED tubes and nowadays T5 LED tubes, the cooling system has become the biggest problem for LED tubes designers. It is not to say that LED tubes cannot be made as tubular structure. But they should have their own sizes and shapes, which is consistent with their own characteristics.
LED High Bay bulbs:
LED bulbs are the oldest residential LED lights in LED lighting industry. However, there are a lot of unreasonable places in their shape designs. For instance, LED chips have much better lighting efficiency, but designers applied opaque covers which obstruct up to 30%-50% lights. This is a rather ridiculous design. Similar to LED tubes, LED bulbs is another LED lamps that followed the design steps of traditional filament lamps. These spherical-shaped LED bulbs actually go against working principles of LEDs. Designers have to reduce the entire volume of cooling sections to have this shape. As a result, most currently used LED bulbs are low powered, with limited luminous flux. Under such circumstances, designers still use opaque covers to reduce brightness further, it is really ridiculous.