taschenrechner casio fx 87 de plus
世界が認めた最強級米国cree社製. UltraFire UF-5C. For example the UltraFire W-878 claims 2000 lumens and uses a single CREE XM-L T6 LED. The specs for the CREE XM-L T6 LED are 11000 lumens. I know it is possible to overdrive the LED and with adequate cooling you can increase the lumens output but still how can one get twice the rated lumens? I don't believe it is true but I thought I'd ask you..