This is a side by side comparison of the rather impressive 660 LED lamp which is rated 40W but measures at just over 38, next to a pair of CFL lamps marked as 45W each but actually drawing about 30W each giving a total of 60W and a standard 60W tungsten lamp.
I used studio softboxes to diffuse the light and make it easier to compare.
The 40W LED lamp has camera-visible flicker, but it's not visible in any way to the human eye, even in peripheral vision.
The 40W LED visibly exceeded the output of the pair of new 30W CFLs even after they had been allowed to heat up to full intensity, and it completely obliterated the 60W tungsten lamp as you'd expect.
