Swedpat
Flashlight Enthusiast
Today I tried some runtime and brightness measurings with Malkoff P7 dropin and a 3D using a 6V MagCharger 2,5Ah NiCd battery. The battery was not fully charged when started.
The regulation is excellent. When measured with a lightmeter and ceiling bounce test I noticed no drop of brightness even after 30minutes constant drive. But then I put off the light for a while. When it had been cool I put on the light again, and then became very surprised. The lightmeter showed an increase of brightness with ca 27%, compared to all the earlier tests. But very soon it dropped down and after a few minutes it was about 20% dimmer then the usual brightness. When it then slowly continued to drop I understood that the battery was low and I put off the light.
I took out the standard MagCharger battery and replaced it to one of my charged 3,5Ah NiMh batteries. Then the brightness was the normal again.
Can anyone explain what happend before the drop with the NiCd battery? How could the brightness increase that much before it dropped? The Malkoff P7 is regulated and works with a voltage between 5 and 13 V, but needs 5,5 V to provide full brightness. If I understand it right the dropin falls out of regulation when voltage goes below 5,5V, and that's explain the drop of brightness below the normal. But what happend when brightness increased with ca 27%? Did the 6V battery a short while increased to more than 13V? Is it possible?
To be sure the lightmeter worked correct I also compared with my Fenix TK10 which all the time showed the same value.
Regards, Patric
The regulation is excellent. When measured with a lightmeter and ceiling bounce test I noticed no drop of brightness even after 30minutes constant drive. But then I put off the light for a while. When it had been cool I put on the light again, and then became very surprised. The lightmeter showed an increase of brightness with ca 27%, compared to all the earlier tests. But very soon it dropped down and after a few minutes it was about 20% dimmer then the usual brightness. When it then slowly continued to drop I understood that the battery was low and I put off the light.
I took out the standard MagCharger battery and replaced it to one of my charged 3,5Ah NiMh batteries. Then the brightness was the normal again.
Can anyone explain what happend before the drop with the NiCd battery? How could the brightness increase that much before it dropped? The Malkoff P7 is regulated and works with a voltage between 5 and 13 V, but needs 5,5 V to provide full brightness. If I understand it right the dropin falls out of regulation when voltage goes below 5,5V, and that's explain the drop of brightness below the normal. But what happend when brightness increased with ca 27%? Did the 6V battery a short while increased to more than 13V? Is it possible?
To be sure the lightmeter worked correct I also compared with my Fenix TK10 which all the time showed the same value.
Regards, Patric
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