For Green Lume - we use a mixture of lume on our hands - 95% C3 and 5% C1 Super-Luminova. This ratio allows the hands to look white-ish when in normal light, with a strong green glow in the dark. The colour of the green glow is very similar to Seiko Lumbirite and is the brightest of all lume colours.For Blue Lume - we offer BGW9 Super-Luminova for some hand models which emits a brilliant blue glow and is the second brightest lume colour.For more information about relative brightness, check out this Super-Luminova Chart.