The one thing that I thought I understood from kesonmis’ answer was that a white point lamp with a strength of 60 was the equivalent of a 60 watt light bulb – now I’m confused again.
So I did some test renders with your values: a ceramic Stanford Bunny as a child’s bedside light, with a white point-lamp about where the lightbulb’s filament would be, the HDRI strength turned down to 0.005, the Exposure on the default of 1, and filmic. Three renders with the lamp’s strength at 60, 6, and 0.6 – none of 'em looked like the light from a 60 watt incandescent bulb (two of them were too bright, one too dim). I was about to post them with “what am I doing wrong” when I realized that I’d scaled everything (including the position of the point-lamp) to the bunny I’d been working on earlier, which wasn’t even close to the size of one on a bedside lamp. Fixed that (against the one in my bedroom), rendered again, and the one with the point lamp on a strength of 6 looks much like the light from a white 60 watt lightbulb in a dark room. Eureka!
But I still don’t understand why the right strength’s 6 instead of 60.
I’m not a photographer – since “with filmic blender you don’t really have to cheat like you were used to and you can use way more realistic values when it comes to setting up lights”, I want to know what the realistic values are. Thanks for your recommendation of Johnson Martin’s informative article, but that says it only addresses the values for Sun and Mesh lamps because they’re measured in units of irradiance – it ignores all other lamp types because they are measured using “another system”. Since some of my renders will be indoors and lit by light bulbs, I also want to know what the realistic values for point lamps are. (And the rest of 'em while I’m at it, just in case.)
When buying light bulbs I like warm white (2700-3000 kelvin), but I figured I could get into color temperature later – for the purposes of this discussion I’m sticking with simple white.