Light-emitting diodes, or LED's, have been in existence for several decades, but only recently have begun to see common usage in numerous applications in an average person's everyday life. Their most noticeable uses are in televisions, computer displays, and household illumination, all of which are used very frequently. The main advantages of LED's over the older technologies used in those areas (CRT, LCD, incandescent, and fluorescent) are that they consume less electricity, generate less heat, and have longer lifespans than do the other technologies, and, most importantly, they are semi-conductors, meaning that they are not limited to a specific form factor (as are the other technologies) and also become more efficient as time passes, an advantage that they share with solid-state drives.
Currently, LED's still are not used as widely as the other technologies, despite their advantages, because the units are still expensive for initial purchase, but I expect that situation to change as the units become less expensive, and that LED's shall eventually replace all other technologies used for lighting or visual displays. What does everyone else say on this subject? Will LED's eventually replace incandescent and fluorescent lighting, and also LCD screens, and how long may it take for that displacement to occur?