Agreed. If you only light through a window, the room may well be kinda dark.  But I supplement with a lamp or two, unless I want it dark, which I often do.

I see this in my own home. My living room is very brightly lit in the afternoons with nothing but sunlight because I have a window that faces almost directly west, and my walls are white. Bedroom faces north and is dim all the time.

Primorge>

Unfortunately, I found using IDL with Poser 8 and an older machine to be an exercise in extreme patience. I often had to render in sections and composite in Photoshop.

It wasn't until I upgraded my machine (quad core), my operating system (64 bit), and my software (Poser Pro 2010), that I found it easy to use IDL consistently and without workarounds such as layered rendering or area rendering in sections. But I was also doing print sized resolutions 3k or 4k pixels on one side minimum. You can get away with much more at smaller resolutions.

However, I think if you're very careful with resources, you can do a lot. Textures are usually far bigger than they need to be for all but close ups. So reducing resolutions on most of the textures in a scene can help with any potential memory issues. Also, testing the sort of render settings you need can help with render times. I usually render about 4kx5k pixels, and I simply do not see a difference between min shading rate of 0.1 and 0.4, for instance. So I save quite a bit of render time by setting it at 0.4. If I did ever notice a difference, I'd change the settings. But only if I needed to.

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.