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Beamer als Lichtquelle?

Projector as a light source?



Frage von Fraggy:
Oktober 2007

Hello.

Mir is a schnapps idea, which may in practice actually works ... But before I s.erste attempts since broadcast, I'd seek some opinions.

HMI lights for film and television are well known, very expensive, their typical light output is 550 watts (probably helligkeitsmäßig about 2K with halogen comparable).
In addition, various intentions to hire Blackcrap the cover etc. ..

Alternatively, one could use a beamer with a decent diffuser before, the prices for comparable high-performance devices are still only at 500 ¬, is also a beamer times easier to organize.

A projector also uses HMI lamps as light sources.

Color filters can completely save you as a beamer with almost any color can be mapped. Even better: to areas with auszuleuchten, just a laptop adapter, and light and shadows with just any painting s.die desired position to conjure. Minute adjustment of the light gates and cover certain areas of the light cone can then in most cases save money.

Possible problems could be:
- Acting unnaturally light
- Pixel structure is not fully wegzukriegen
- Flicker when DLP projectors
- Hard light only with pixel structure

On the other are a lot of advantages:
- Any color, brightness distributions per headlight
- Any light situations representable
- Easy Abschattieren
- Cheaper price

By the first tests I can do, it will probably still take ... what do you, is it worth the time to try?



Antwort von deepcode:

s.sich not a bad idea, especially if you use something creative .. but just remember the special lamps for beamers crazy expensive, because then the relative fast.
As an alternative for high-quality light: a look at times HQI lamps, Color Rendering Index (CRI) and efficiency are close to HMI but much cheaper. Or high quality Full Spectrum lamps / energy saving light bulbs, 30 watts approx $ 20 and bright as a 500 watt halogen, CRI also very good and almost no heat.



Antwort von peterM:

For the first beamer arebiten not with light but with HMI Quedcksilberhöchstdrucklampen. This gives them in a super short arc (below 1.5mm), but an even worse color than even HMI lamps. The red is just too weak
Furthermore, the light output so happens to be very low.
we take the time a Fainiss halebr Abild Stufenlinser such as a lamp. Typically, these 575 HMI with a burner which is fitted around 50000 lumens makes gross. Depending on the setting come to the light cones around 15000 to 20000 lumens.
A beamer leave the 500 euro makes less than 2000 lumens, and even from 4000 to 5000 Euro Beamer make so 5500 max lumens.
Natürlcih can the pixel structure by light defokusieren to bring disappear. The remaining focus is still higher than with light gates of a conventional lamp.
The main problem with the beamer was then told how the Weisabgleich be the case in conjunction with recognized light.
the single chip DLP projector, depending on the color and Kamereaverschlusszeit synonymous nor flicker effects.

For (color / shadow) Effects sure the idea is nice and synonymous is not entirely new, some already have James Bond prestressing projectors used.
And I myself have previously partially in the absence of a suitcase Dedo happy times with working slide projectors. Who sowas with Indonesia andenkt old slide projector, the lamp a little span so that the light is white.








Antwort von Fraggy:

ok, I see a man with that film in terms of intensity headlamps will not be able to. But what so that targeted specific areas in the Picture abzuschatten / aufzuhellen, with a shade or order?

With regard to the problem with poor color, is the LCD panel in a projector is not of a priori so that there were irregularities in the light spectrum offsets? The color temperatures are known.

What is it with colored light from a beamer. If this is worse in principle than a conventional headlamp with colored?

In direct comparison to halogen lamps, the light output so still relatively high in comparison to power. Can you mix light "beamer / traditional halogen bulbs create light warmer in accordance with the projector?

I think I will in any case, test times. If I produce good results, so I can post here.



Antwort von DWUA:

@ Fraggy

Mach is absolutely!
Rumfummeln with a variety of light sources.
Experimentation.

Inpatient serves OHP offers a simple example, different liquids Diaphanes to run into each other.
Using DIA-projector displays the "Mona Lisa" on the forehead of a "Lisa".

But as a light source for projectors Filmerei not suck.
The "Ball-house discussion on" Greetings.

;)




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