Just by looking at the curves from the spectrograph we can see a big difference in irregularity. The most regular is halogen, incandescent improved, but the compact fluorescent lamp is worse, with a peak at 435 nm and one at 490 nm, while leds it is 450 nm, ditto for led lighting screens.
On the other hand, the glasses manufacturers offer filtering glasses (new juicy market). If he had a real efficiency, he could apply it directly to the glass of bulbs ??
I give the link of the file of "digital"
Contradictory, it would have been necessary to compare with equivalent lighting in lumens.Bulb measurements at 2 700 K
We absolutely wanted to check the amount of light in home lighting that is more 2 700 K than 6 500 K. Again, appearances are misleading. We observe that the quantity of blue light between 415 and 465 nm is significantly greater with halogen than with LEDs and compact fluorescent. Indeed, the values harvested are surprising: if the leds diffuse 7,3% and 6,4% of blue light, the fluocompact it, emits 7,9%. This is played, of course, in a handkerchief, but it is interesting to specify it. Finally, the halogen gets better, with 3,4% blue light sent proportionally over the entire spectrum.
I checked: led 8.5 W = 806 lm fluo 12 W = 741 lm, halogen 28 w 290 lm