HMI / Tungsten
Posted 13 March 2008 - 09:39 AM
I had always been of the opinion that an HMI would have a greater output per watt than a tungsten fixture.
i.e. a 2.5K HMI at 10ft distance = 800fc
a 2.5K Tungsten at 10ft distance = 600fc
assuming that the lens and dimensions of the fixture are identical.
Can anyone shed any light (pun intended) on this.
Posted 13 March 2008 - 11:12 AM
Arrilite 2000K 10ft 295fc
Arri Fresnel 2000K(flood) 10ft 283fc
ArriSun 40/25(2.5K lamp - flood) 17ft 832fc
Arri Fresnel 2000K (flood) 10ft 412fc
You can see more difference when use Arrisun but at general terms always you get more "effective" power on HMI than tungsten. Tungsten lights use 70% of the power producing heat (correct me if i made a mistake).
Posted 13 March 2008 - 03:54 PM
Harry Box has the answers.
"An HMI puts out about four times as much light as a tungsten light of the same wattage, 85-108 Lumens per watt of electricity, compared to 26 lumens per watt for tungsten bulbs.
Posted 13 March 2008 - 04:29 PM
Edited by Michael Collier, 13 March 2008 - 04:32 PM.