LED, Tungsten, HMI and Florescent Lights

LED, Tungsten, HMI, and Florescent Light



LED: Light emitting diode, 

Tungsten: Tungsten lighting is a term used by photographers to distinguish from fluorescent lighting or strobe lighting. Tungsten is a type of incandescent lighting using a bulb with a filament made of the metal tungste.

tungsten lamps are produced in two types, having very specific "color temperatures:" type B lamps, the most common, have a color temperature of 3200 degrees Kelvin (3200°K); type A lamps had a color temperature of 3400°K 





HMI: Hydrargyrum medium-arc iodide...The lamp operates by creating an electrical arc between two electrodes within the bulb that excites the pressurized mercury vapour and metal halides, and provides very high light output with greater efficiency than incandescent lighting unit.

With HMI bulbs, color temperature varies significantly with lamp age. A new bulb generally will output at a color temperature close to 15,000 K during its first few hours. As the bulb ages, the color temperature reaches its nominal value of around 5600 K or 6000 K. 

Floreescent:  They are generally very soft lights and tend to look great as key lights for interviewing subjects. The biggest problem with this lamp type is that they can't be dimmed by a simple variable resistor dimmer. Since fluorescents work by using bursts of electricity to fluoresce gas inside of a tube, cutting down on the amount of electricity to the fixture will either make the light blink or turn off altogether. 

Temperature	Source
1,700 K	Match flame, low pressure sodium lamps (LPS/SOX)
1,850 K	Candle flame, sunset/sunrise
2,400 K	Standard Incandescent lamps
2,550 K	Soft White Incandescent lamps
2,700 K	"Soft White" compact fluorescent and LED lamps
3,000 K	Warm White compact fluorescent and LED lamps
3,200 K	Studio lamps, photofloods, etc.
3,350 K	Studio "CP" light
4,100–4,150 K	Moonlight[2]
5,000 K	Horizon daylight
5,000 K	Tubular fluorescent lamps or cool white/daylight compact fluorescent lamps (CFL)
5,500–6,000 K	Vertical daylight, electronic flash
6,200 K	Xenon short-arc lamp[3]
6,500 K	Daylight, overcast
6,500–9,500 K	LCD or CRT screen
15,000–27,000 K	Clear blue poleward sky