Vray sphere light

[Arnold Grove]

I must be missing something simple because when I use a vray sphere as a lightbulb inside a hanigng fixture and it blows everything out with light ie; things closest to it...the fixture and ceiling. I want the light inside the fixture to be blocked. The rest of the light Im getting is nice and close to what I want.

 

Im using Luminous power (lm) multiplier at 750 w/ a 4.5' radious. What am I missing?

 

thanks ag

[jophus14]

Do you have No Decay ticked? If so then the light is infinite. Why do you have the radius set so big? What do you mean when you say that you want the light inside of the fixture to be blocked?

[Arnold Grove]

Its a warehouse light hanging a few feet from the ceiling...naturally these point downward...and the only light hitting the ceiling should be bounced via GI...but it blows out the model of the fixture and lights the ceiling up...so,,,the geometry of the fixture isnt blocking the light from the vray sphere.

 

no decay is not set...Im getting falloff...and my multipliers and radious are giving me basicly what I want..Im twekaing the numbers but I still have light blowing through the model of the fixture.

 

I have other lights...omini's, spots, ies and they are off. So like I said..Im getting falloff and nice illumination but the light goes through the model..its not behaving like a real world light bulb.

 

Omnis do but im not getting the nice light like you get from vrays or IES's

[mmowry]

Try reducing the radius to 3 or 4 inches, and increasing the intensity to replace the lost light. The bleed will decrease.

 

-Michael

[jophus14]

This is true. Think of the size of the bulbs. The light is affecting everything around it because the size of the "bulb" is protruding out the side of the fixture.

[Arnold Grove]

trying new...ill try to post test render

[Arnold Grove]

I thoguht the size of the circle showed the light attenuation....like omni's..i see what I did wrong....you guys are the hippist of the hip

 

so then the best settings to simulate a bulb are the 2 options that depend on the size of the light circles ?? thanks ag

[jophus14]

The radius setting of the light is acting as the size of the light and not the attenuation. I would set the light to be the size of a standard bulb and bump up the multiplier. The larger the radius the less of a multipier you will need and vice-versa. A standard size bulb (1.25" radius) might have a multipier of 100 to were a light of 1' radius might only need a multipier of 5.0 to give off the same light amount.