I dun have LE ROO but only this basic rubber clad in steel.
Under broad daylight:

then use a torch to blast at it for 1 sec:

then u have a very bright lume...Yay..

but only lasts for seconds, and quickly weakens. in no time it will become barely noticeable.
so yes, it does have lume, but i think it is not up to the expected level for such a high-end sports watch...