Vray IES lights

[PIXELBOX_SRO]

Hello all,
Just wondering why is it necessary to raise vray IES light power to so high power to be able to see it

i usually set it to somewhere around 500.000!

lets say i wanna translate this to watts or lumens? what would be the math here?

thanks a lot for any reply

best regards

[vlado]

You will need to use correct scene units for your scene to get accurate results with IES lights.

Best regards,
Vlado

[PIXELBOX_SRO]

so if my scene is in centimeters, what does power 500000 correspond to?

[WWX]

IES light stregth

I have had similar difficulty with getting IES to "work"

I do wonder if the actual IES files does not play a role in this.

My scenes are always modeled at scale 1:1 and in mm.

[PGD]

I have the same issue. Scenes always in 1.0 mm...

When these lights are switched on I have difficulty viewing the scene too, areas go white making viewing the geometry difficult, any cure for that?

[PIXELBOX_SRO]

its important to choose good units when u start a new project as with some u can easily go out of scene bounding box...but still the question remains....

if there is a scnene in mm, cm or m....what does a certain power value of the ies light correspond to?

i also think it depennd on the initial power of the ies file as well, but still...would eb nice to know more

[skogskalle]

do you guys use the physical camera? if so do you use realistic exposure-settings? When you create a new vray physical camera the exposure is fine for outdoor scenes with vray sun/sky, but way too dark for say an indoor scene lit with ies-lights...

I rarely use ies-lights myself, so i dont know if this is your problem... just a thought.

/k

[PIXELBOX_SRO]

well thats mostly why am asking...as i have to turn the ies lights waaaaay up to be able to view the map nicely

[PGD]

I run physical camera and adjust the exposure to suit an internal render. Not sure what setting the light is on, I just turned it up untill I got the effect I was looking for. But the whiteout of geometry is difficult to work with, so I end up switching the lights off to work... and that cant be right

[khoross]

im using ies light in a current project, the scene is in meters, phisical cam setting ( iso 8oo shuter speed 5 fstop 3.5" as u would set up a camera when shooting at night & the result im getting are very realistic without adjusting any of the IES power