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August 14th, 2006
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#1 (permalink) |
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Veteran Member
Join Date: Oct 2004
Location: Croatia
Age: 75
Posts: 522
Name: Mario Pende  |
100W Light Blub
Source type: Point
Distribution: Isotropic Magnitude: Luminous Intesity Candelas : ???? I found reading Ls Help that one light blub has intensity of 139 cd. If I use this amount, the room stays dark. Help
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Beeeee! |
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August 17th, 2006
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#3 (permalink) |
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Junior Member
Join Date: Jun 2003
Location: Beirut, Lebanon (+2GMT)
Posts: 14
Name: Majdi Hajjar  |
Re: 100W Light Blub
A 100W bulb emits a flux of 1360 lumen (Osram lamp).
This gives a uniform intensity in space of 1360/(4x3.14) = 108 candela. Which is not far from the value given in Lightscape. What is the size of your room? The height? What colors and reflectances are the ceiling, walls and floor? Then I can calculate the lux level on a horizontal plane (illuminance). To see something on the screen, just boost the brightness in the properties menu. This will only change the screen appearance without changing the real values. Hope it helps.
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Majdi Hajjar Lighting Designer |
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August 17th, 2006
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#4 (permalink) |
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Veteran Member
Join Date: Oct 2004
Location: Croatia
Age: 75
Posts: 522
Name: Mario Pende |
Re: 100W Light Blub
Majdi, the room is 4x3 meters, height is 2,7 m.
If I boost the brightness than I will have a problem. My materials are always set for brightness/contast level at 50/50 (default).
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Beeeee! |
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November 5th, 2006
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#5 (permalink) |
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Veteran Member
Join Date: Oct 2004
Location: Croatia
Age: 75
Posts: 522
Name: Mario Pende |
Re: 100W Light Blub
This is Ls block that I used as a luminarie, its a 100W lamp. Point, isotropic distribution.
The room is 4x3x2,7 m. Reflectance of materials around 70%. Also I made the cover of the lamp non occlouding, but still the room is black.
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Beeeee! |
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November 6th, 2006
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#8 (permalink) |
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Veteran Member
Join Date: Oct 2004
Location: Croatia
Age: 75
Posts: 522
Name: Mario Pende |
Re: 100W Light Blub
Are these like the real values you would get when illuminting a room with 140cd?
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Beeeee! Last edited by del82; November 6th, 2006 at 06:23 AM. |
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November 6th, 2006
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#9 (permalink) |
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Senior Member
Join Date: May 2002
Location: New York
Posts: 225
Name: Arnold Gallardo     |
Re: 100W Light Blub
Hmm let me guess you are comparing your impression of a 100 watt lightbulb with your brain and eyes right as to what you get with your render ? have you actually considered how much exposure you will need to get a bright room with a camera?
The reason it is dark is because of the tone mapping in LVS. The tone mapping in LVS is set for mean values rather than mapping the perceptually important tones hence LVS does not know which areas ARE IMPORTANT to YOU. It uses a very simple cut off rate of displaying the computed luminance. This is why the file-properties- tone adjustments are there for because only YOu can tell which areas of the scene are important to you.
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_ _ ______________ _ _ Arnold Gallardo Visual Content Creator Technical Writer Author:'3D Lighting: History,Concepts and Techniques' |
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November 6th, 2006
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#10 (permalink) |
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Veteran Member
Join Date: Oct 2004
Location: Croatia
Age: 75
Posts: 522
Name: Mario Pende |
Re: 100W Light Blub
o.k. I understand this taht I can control the level of brigtness to get disered results, but are thies the real values you would get?!
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