This is the other thread you should read.

http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2762503

Read the opening post for WHY - It's quite clear. Copied below with emphasis.

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I know, I'm becoming an ass about this. But I'm really tired of seeing linear-encoded renders.

None of us has a display device encoded in linear color space. We all have monitors and printers that show images correctly if they are in sRGB color space.

Linear color space is similar to sRGB color space. It is not the same.

Inches are similar to centimeters, too, but you can't just replace one with another.

In sRGB color space, the value .5 is not 50% as bright as 1. It is only 21.7 % as bright. Please stop posting renders for devices nobody owns. Or, **when you post such images, apologize to the viewer for making them look at something you could easily correct, but you refuse to.
**
Thank you.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)