Sorting through all the power and preset modes on this Casio can definitely be described as confusing.
The story plays out like this. There are two "non" Eco modes - Bright and Normal. They are available when you turn Eco to Off. In a sense, consider Normal to be the Eco of Bright mode.
If you have Eco turned on though, you get five "Preset" modes, each with names suggesting their best use: Standard, Graphics, Theater, Blackboard and Natural.
And each of those has five different brightness levels, signified in the menus as 1 eco leaf, to 5 eco leaves. Eco 1 leaf is the brightest and shown in the table in the 2nd column, the same one that shows the measurements for Bright and Normal, as those are the brightest measurements for those modes. The right most column shows the brightness of those five presets, when 5 leaves are selected - the most eco friendly, and least bright of the Eco choices. As you can see, even in the lowest of the eco modes, the range runs from 661 lumens to 1158 lumens.
That doesn't sound like much, but if your setting has controlled lighting, so that these modes in Eco 5 are bright enough, then you have a projector that's drawing only 110 watts! Most projectors in this class (around 3000 lumens max) draw 250 to 400 watts, so that's a noteworthy savings. Still, I doubt that most users will want to dim lights enough to get by with mostly under 1000 lumen brightness.
I did measurements of the differences between the 5 levels of eco. They played out as follows.
Relative to Eco 1:
Eco 2 is down about 24% from Eco 1
Eco 3 is down about 30% from Eco 1
Eco 4 is down about 38% from Eco 1
Eco 5 is down about 46% (as you can see in the table)
What's that all mean?
The Casio measured at maximum almost exactly as claimed, 3119 vs the brochure says 3100 lumens. That's about dead on.
By switching to the Eco modes you get a variety of presets, with different color balances and color accuracy. Definitely some look better than others, but that was discussed in the Picture Quality section. Let's just say again, that Bright mode is very strong on yellows, greens and reds are on the dark side. Normal is a little better, but still emphasis is on brightness rather than color. Not surprising, Theater, and Natural are the two best looking modes if you need fairly accurate color, with only Theater doing a very good skin tone, as even Natural is still a bit too yellow.
As a result, let's say that when you want very good color the projector still serves up respectable brightness, with almost 1500 lumens in Theater, and almost 1850 in Natural.