Reproduction of the historic Bulbo 57 lamp in the dimmable suspended LED version with diffused light, designed in 1957 by Achille & Pier Giacomo Castiglioni. The original tungsten filament is reproduced exactly with an LED source, maintaining the warm light temperature. Flexible micro-LED filament 225 mm long from 6W to 2200 ° K which emits a luminous flux of 210-450 lumens.
A bulb-shaped lighting unit made of blown borosilicate glass, with good shock resistance properties and excellent transparency, due to the reduced thickness of the material. The led filament is held in position by a molybdenum structure incorporated in a thin tube, also made of borosilicate, which is used in turn to extract the air and therefore prevent any internal condensation build-up. The filaments which convey the power are housed in a dedicated cable gland designed to satisfy the safety regulations and standards. The light source consists of a 225 mm long flexible micro-led filament, using customised electronics which can handle a light flow of 210 - 450 lumen, using the most common Triac dimmers. Luminous flux is in proportion to the voltage for each lighting fixture. The light temperature of 2200°K was selected to replicate that of the traditional incandescent lamp. The same applies to the high CRI (95), which guarantees a high quality standard of chromatic performance.
The two appliances are installed in the ceiling using a polycarbonate rose from which the power cables run. Customised installations can also be created with the two nylon wires which hold the appliances to the two supports to be fixed to the ceiling.
Bulbo was designed for an installation at the XI Triennale in Milan in 1957. A large industrial bulb deprived of its screw cap and with a shortened neck to take the shape of a bubble, with a filament inside as the distinguishing feature. The 2019 edition by Flos reproduces the classic filament in tungsten with an LED source, preserving the same color and intensity of the light as in the original. When designing means breaking down or deconstructing, and shapes are forged through observation of what already exists , these are some of the commandments put in place by the Castiglioni brothers. In the case of Bulbo the rule of simplification is very clear. This lamp is a synthesis of redesign and ready-made: a large industrial bulb without its screw cap and with a shortened neck to take the shape of a bubble. The classic filament inside becomes its distinguishing feature, both decorative and illuminating. The light source itself highlights the technical design that characterizes this lamp, and also makes it work.
After dismantling the Triennale exhibition in 1957, four Bulbo lamps were installed at Achille s home and two were set in the Studio at Piazza Castello 27 in Milan, now home to the Castiglioni Foundation, where they are still showcased.
6 W. The light source is guaranteed for 15,000 hours, with a flow loss of less than 20% in the course of time.