1. This is a large size soft Led tube bulb, the diameter is 38mm, length is 300mm, we also can do it 320mm, the longest tube led bulb we can do is 1000mm. Comparing to normal 300mm tubular led bulb, this soft led tube bulb has wider diameter, which is 32mm. 300mm flexible soft led filament forms a six circle spiral filament design. E27/E26/B22 medium size lamp base. Non-flickering 0-100 full range smooth dimming, soft starting.