Selfbuilt, would you have an estimate of runtime of the Nichia 219 medium 30 lumen level with and eneloop 2000?
Short of running a test, is there a formula for something like this.
Thanks.
Performed my own runtime test today,
using Energizer L91 Ultimate Lithium AA cell
(mfg. 7/2014) (expires 12/2034)
Nichia 219 on Medium mode (30 Lumens)
lasted 14.5 Hours in perfect regulation.
By 15 Hours, had dropped by 4.7 f/stops
(measured on my Sekonic DC308 meter)
This means output is now at 0.04%,
or 1/25th of original output of 30 Lumens.
By 18 Hours, had dropped 6 additional
f/stops. Thus, 1/64th of the 15 Hr. reading.
By my humble calculations, that means
an output of about 0.018 Lumens.
That's approx. 1/3 of Firefly mode !
Pretty Damn DIM by this point,
but not *TOTALLY* useless.
Must say --
I certainly DO like this light.
Wish all those lovely Colors were still available !