The new ECO mode (patent pending) almost doubles the expected lifetime of the flash capacitors compared with BOOST mode. From a user point of view ECO mode and BOOST mode are almost identical. The only difference is that the max (flash) light output is increased by 0.2 f-stops in BOOST mode. Flash duration, color temperature and recycling speed are identical between the two modes.
The way it works is that ECO mode only charges the flash capacitors 95% full (They are fully charged in BOOST mode). This small change vastly reduces internal stress on flash capacitors and power components. And since the flash capacitors are always charged while the unit is in operation it has big impact on the expected lifetime of the unit. Our strong user recommendation is to always have flash mode set to ECO mode except in rare events where a little more max light output is really needed. ECO mode is also the factory set flash mode.
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