Q: about lights...

Common Common :: Render Theory
1

Hi!

How can I calculate, what must be the multiplier value for a real light?
For example: I have 100W light bulb in my scene (radius i.e. = 1) - how I can know, what multiplier I must set?

Anyway, thanx for creating VRAY! :wink:

2

oohh good question, but i dont think it can really be answered right now. Lights native to max and vray aren’t really unit dependant so like i said, not sure how you could answer that. Hopefully in the future, vray will have its own built in support for ies data with its own lights and such…

3

why dont you use Photometric lights…
they work perfectly with vray and you know how much power its emmiting.

try this site and look for the i drop download,

you can get all sorts of lights from there, and all the ies files.

4

I have the exact question but mine is a little more refined now that I read this thread.

I did my research and found the bulb manufacturer Ushio, had them e-mail me some photometric data from the bulbs I’m using.

Now that I have the Light Distribution Profile…

should I just try to find a halogen at Erco with a similar distribution or is there a better way to get a match?

Thanks,
--Jon

5

isn’t it possible to load ies data into the photometric light sources so you can custumize them?

Vance Miller

6

on their site i notice viz mentioned but i dont see mention of max. Are these ERCO lights not compatible with max? I think i read that max5 has something like that. But what to max4 people do. Wouldnt it be possible to do tests with different settings in realworld units and write up a list of multipliers needed to recreate bulbs of certain wattages?

7

you can use the viz lights on the erco site.
or you can get the ies files and just use those.
just put a photometric standard light into your scene and then specify the web file that you have downloaded.
or you could use i drop in the erco site… the starpoint lights are the best ones.

natty

8

like i said…what about us max4 users

or are these viz lights just standard max lights setup with the correct multipliers and falloffs?

9

Thanks Elf, I guess I should have said that I use Max4.

I only have an image of the data, which was faxed to me, not an actual digital format of it.

I thought there may be a way to enter these values int Max4.

Any ideas?

Thanks,
--Jon

10

in max 4 with the free luminaire plugin

11

hmm..it seems that the site is down. if you want i can send you the plugin

12

Thanks so much :smile: :smile: :smile:

--Jon

13

Just one other question if this plugin dosen’t work out. (Plan B :smile: )

I’d like to be able to use a more realistic lighting similar to some stage lights I’ve recently purchased.

Here is the kit I’m waiting on in the mail: (sounds like I’m waiting in the box but I’m just bad at grammar :wink: )

http://www.nrgresearch.com/quartzkit.htm

Could I compare them to the Focalflood family on Ercos site or would someone suggest a better comparison?

Thanks in advance,
--Jon

14

good question
good answer!
thanks