Here's my R5 on the left, photographed next to my XM-L T6 on the right; 210 vs 460 lumens.
The total light output (in lumens) = the brightness/intensity (in lux) multiplied by the surface area of illumination (in square meters).
When you ask, will it be significantly brighter, what do you mean?
Do you mean the total volume of light output in lumens, which takes into account both the brightness/intensity, and the surface area of illumination?
Or do you just mean the maximum brightness/intensity of the hotspot only? Measured in lux.
Did you know that the wider the surface area of illumination, the more lumens you have?
So in the photograph below.
The R5 has a more intense/bright, yet smaller hot spot, and the lateral spill is the same size but dimmer.
The XM-L T6 has a larger but less bright hot spot; the spill is the same size, but brighter.
For outright throw, the R5 will throw further.
For a wider surface area of illumination, the XM-L T6 will illuminate a wider surface area.
Generally speaking, the XM-L is not as bright, but it lights up a wider area.
However, the most important difference between these two emitters is that, the XM-L T6 has only a
small decrease in brightness/lux [hence only a small loss in longitudinal throw], for a
significantly greater gain in lateral surface area of illumination - hence 460 lumens, versus only 210 lumens.
For total lumen output, taking into account both the brightness and the surface area of illumination, the XM-L T6 is vastly superior...
