- #36
Tom Rauji
- 45
- 6
Many of the answers here are completely unrelated to one-day filament life, especially wattage and finger prints. A filament is designed for a certain voltage. When normal voltage is applied, the filament (from current flow through the cold resistance) rapidly heats to a certain temperature. That temperature, along with filament design, sets the hot running wattage and current. The short term life is related only to mechanical considerations like shock or vibration, build quality, and running voltage. If it is a 120V lamp on 120 nominal voltages, it will have the same short term life virtually independent of fixture dissipation rating. This is because there is immeasurable difference in filament temperature based on envelope temperature.
The main deterioration from finger prints or ventilation (dissipation) is long term envelope damage. It takes a pretty messy fingerprint to hurt an envelope by making a hot spot. Most damage worries from excessive wattage are long term gradual thermal damage to the socket area from heat.
If his lamp voltage was correct, for one day life he almost certainly either received a bad bulb or the bulb had mechanical shock or vibration damage. Higher light emission bulbs have shorter life for a given style of construction because the filament runs hotter, but he had an extreme. It is 100% certain if he had the correct voltage, a one day life could only be from a damaged or defective lamp.
The main deterioration from finger prints or ventilation (dissipation) is long term envelope damage. It takes a pretty messy fingerprint to hurt an envelope by making a hot spot. Most damage worries from excessive wattage are long term gradual thermal damage to the socket area from heat.
If his lamp voltage was correct, for one day life he almost certainly either received a bad bulb or the bulb had mechanical shock or vibration damage. Higher light emission bulbs have shorter life for a given style of construction because the filament runs hotter, but he had an extreme. It is 100% certain if he had the correct voltage, a one day life could only be from a damaged or defective lamp.