Fenix TK-70

[Labrador72]

The TK70 is a great light. I also buy older Fenix lights all the time: great deals and outside isn't darker now than it was a couple of years ago!:thumbsup:

 

[ssideup]

I have had mine for over 12months now and am still loving it. I am using Medion D cells giving about an hour on Turbo. I have measured the tail cap draw and it reads a little more than 11amps. Anyone else have info like this on their own TK70?

 

[HKJ]

I have had mine for over 12months now and am still loving it. I am using Medion D cells giving about an hour on Turbo. I have measured the tail cap draw and it reads a little more than 11amps. Anyone else have info like this on their own TK70?

I did check it when I reviewed the TK70 long time ago, my copy draws slightly less:

 

[shelm]

I did check it when I reviewed the TK70 long time ago, my copy draws slightly less:

HKJ, why must the wattage increase with falling voltage for the brightness to be held constant? I thought that brightness is proportional to wattage

 

[HKJ]

HKJ, why must the wattage increase with falling voltage for the brightness to be held constant? I thought that brightness is proportional to wattage

The brightness is proportional to the power that reaches the led, not to the power used from the battery, i.e. the culprit is driver efficiency!
It is probably due to the higher current, i.e. driver efficiency goes down with increasing current.

 

[shelm]

The brightness is proportional to the power that reaches the led, not to the power used from the battery,

Oh okay, that makes sense
Thanks for the evaluation!

 

[xoomercom]

I sold this light a while back on ebay and dont miss it a bit. The thing was HUGE!!!. Fenix must be embarassed of that thing. I too noticed that its been removed from the website even though older lights are still in their lineup.

 

[kj2]

I sold this light a while back on ebay and dont miss it a bit. The thing was HUGE!!!. Fenix must be embarassed of that thing. I too noticed that its been removed from the website even though older lights are still in their lineup.

I still got it and I like it
Yeah it's big and heavy, but the light it puts out still puts a real big smile on my face