I have been working in a professional theatre. There you have the saeme things, a manufacturere that claims their lamps do it better.
We had lamps from 1000Watt each(PAR64), 50 of them above the orchestra, because of the heat and power consumption we looked for different lamps.
The 80 musicians were very keep on enough light, so they could read the music. Which is mostly on not to white paper.
We exchanged the lights with ETC 500watt lights. They were happy.
Why? well the ETC uses a lamp that gives a bit less yellow light, more blue, not much, but enough that noone found out that they were actualy having less light.
It didn't look less, but we measured it with an instrument. I think they ended up with 70% of original lighting level. We did comparisons next to each other it didn't look less light, maybe even a bit more. Just because the blue.
The gains were less heat generation above the stage, which is pleasant for them, less power use and we didn't need to cool the hall that much.
So a bit more blue gives you the idea that you have more light.