 LEDs were chosen because they were viewed as the lowest maintenance option of the possible color changing fixtures . LEDs fit into an electrical circuit , causing illumination by the movement of electrons in the semiconductor material and making a filament unnecessary , so the bulbs never burn out and do not get too hot . Fins were added to the screens to keep direct sunlight from hitting the LEDs . Color Kinetics ( now part of Philips Solid @-@ State Lighting Solutions , which is now called Philips Color Kinetics ) ColorBlast 12 LEDs fixtures are used to illuminate the tower structures and glass in an attempt to meet Plensa 's objective that the towers have a light and translucent appearance , with their internal structures reflecting light from behind the glass surface . The electronics were designed to be adaptable to the time of day , weather and season and to meet the desired century @-@ long longevity and dependability objectives set by the design team in response to the thirty @-@ year directive . 
 LEDs <a href='uninflect' title='1'><mark>were</mark></a> chosen because they <a href='uninflect' title='2'><mark>were</mark></a> viewed as the lowest maintenance option of the possible color changing fixtures . LEDs fit into an electrical circuit , causing illumination by the movement of electrons in the semiconductor material and making a filament unnecessary , so the bulbs never burn out and do not get too hot . Fins <a href='uninflect' title='3'><mark>were</mark></a> added to the screens to keep direct sunlight from hitting the LEDs . Color Kinetics ( now part of Philips Solid @-@ State Lighting Solutions , which is now called Philips Color Kinetics ) ColorBlast 12 LEDs fixtures are used to illuminate the tower structures and glass in an attempt to meet Plensa <a href='null_genetive' title='4'><mark>'s</mark></a>objective that the towers <a href='got' title='5'><mark>have</mark></a> a light and translucent appearance , with their internal structures reflecting light from behind the glass surface . The electronics <a href='uninflect' title='6'><mark>were</mark></a> designed to be adaptable to the time of day , weather and season and to meet the desired century @-@ long longevity and dependability objectives set by the design team in response to the thirty @-@ year directive . 
LEDs was chosen because they was viewed as the lowest maintenance option of the possible color changing fixtures . LEDs fit into an electrical circuit , causing illumination by the movement of electrons in da semiconductor material and wit a filament unnecessary , soo tdabulbs never burn outt and do not get too hot . Fins was added to thdacreens to keep direct sunlight from hittin the LEDs . Color Kinetics ( now part of Philips Solid @-@ State Lighting Solutions , which is now called Philips Color Kinetics ) ColorBlast 12 LEDs fixtures r used to illuminate thedawer structures and glass in an attempt to meet Plensa  objective dat the towers got a light and translucent appearance , with their internal structures reflecting light from behind the glass surface . The electronics was designed to b adaptable to the time of day , weather and season and to meet the daired century @-@ long longevity and dependability objectives set by the ddagn team in response to the thirty @-@ year directive .