Lighting cycles / watts lux etc


(Delazouch) #1

If this has been asked before sorry

I’m looking for more control over lighting
is there a way to convert the power settings to watts?
Or add ons that give you more control over the lighting ?

Thanks for your time and if you can point me in the right place

regards

Gav


(Richard Marklew) #2

Cycles lamp strength for point, spot and area lamps is specified in Watts, while Blender Internal has no clear physical unit that I know of. For Cycles this means you typically need higher values, as you couldn’t use a 1W lamp to light a room, you need something stronger like a 100W lamp. For Blender Internal the default Distance of 30 means you can use lower strength values.
Sun lamps in Cycles are specified in Watts⁄m2, which requires much smaller values like 1 W⁄m2. This can be confusing, but specifying strength in Watts wouldn’t have been convenient, the real sun for example has strength 384600000000000000000000000W. Emission shaders on meshes are also in Watts⁄m2.


(Delazouch) #3

Richard , I’ve read that in the Wiki
now the blender cycles it says in watts and loads a default 100w lamp in
but has a distance of 30m

so do you scale the lamp to change the distance ?


(TiagoTiago) #4

Sounds like you’re mixing different things; that isn’t exactly what it says…


(CarlG) #5

“Cycles lamp strength for point, spot and area lamps is specified in Watts, while Blender Internal has no clear physical unit that I know of.”
Oh man, that is soooo nice to know. Now I can at least tune physically sized meshes to match some reference lighting. Thanks for the pointer.