In the smaller ìone chipî DLPís, as well as the ultra portable LCDís, the lamps typically last around 1000 hours. There are a few models that will last longer, available. In the ì3 chipî ultra high brightness DLPís, also known as ìlight valvesî, the lamp power supplies are typically variable, enabling lamp hours from 1000 hrs to as much as 4000 hrs depending on make and model. The DILAís tend to follow this formula as well, but their starting lamp costs are much higher than the little DLPís and LCDís. The DILAís are around $900 to replace, while the ultra-portable DLP/LCDís run around $450 on average. The super-brights start at about $1000 and can top $5000 (yes, thatís 5 bucks an hour to watch TV ñ and you thought the cinemas were expensive?). Fortunately, few of us have the need for one of these mega-bright projectors.