Incredible DIY light!!!!
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Incredible DIY light!!!! .
Very nice build, indeed.
But some of his specs are a bit questionable: He says that the bFlexes drive every set with full 1A ... and the total current consumption from the battery is 1A too, therefore the 2+ hours runtime. This doesn´t fit at all ...
First ... it´s not so easy to drive 4 Crees from a 14.4V battery. Assuming they´re mounted in series as usual, the combined Vf of them should be close to 14V and then you´ll need atleast 1V overhead for the driver too, losses due to ohms law not included ... so this works only if the battery is fresh, or you have LEDs with a low Vf. Another result of this thought is that the current consumption of each bFlex is roughly 1A.
Second ... simple math. A Cree at 1A has a Vf of 3.5V, so let´s say simply each emitter takes 3W: 12 emitters with 3 watts are 36 watts in total, with driver efficiency of 90% the battery current should be at least 2.5 Amps (with 16V battery voltage) ...
My conclusions ... this guy is a good mechanic, but has very little knowledge of the electric side
. Maybe he doesn´t know better, has wired the emitters in parallel, or forgotten to configure the bFlex probably. And obviously he hasn´t seen the power of 2.500 lumens before ...
Kurzes Fazit in Boardsprache: Der Typ hat eine schöne Lampe gebaut, aber von der Elektrik hat er keine Ahnung. Die Emitter laufen vermutlich mit 350mA und niemals mit 1A, wie er angegeben hat. Entweder er hat die Emitter parallel geschaltet oder vergessen, per UI den maximalen Strom auf 1A zu erhöhen ... keine Ahnung, aber trotzdem schönes Ding
But some of his specs are a bit questionable: He says that the bFlexes drive every set with full 1A ... and the total current consumption from the battery is 1A too, therefore the 2+ hours runtime. This doesn´t fit at all ...
First ... it´s not so easy to drive 4 Crees from a 14.4V battery. Assuming they´re mounted in series as usual, the combined Vf of them should be close to 14V and then you´ll need atleast 1V overhead for the driver too, losses due to ohms law not included ... so this works only if the battery is fresh, or you have LEDs with a low Vf. Another result of this thought is that the current consumption of each bFlex is roughly 1A.
Second ... simple math. A Cree at 1A has a Vf of 3.5V, so let´s say simply each emitter takes 3W: 12 emitters with 3 watts are 36 watts in total, with driver efficiency of 90% the battery current should be at least 2.5 Amps (with 16V battery voltage) ...
My conclusions ... this guy is a good mechanic, but has very little knowledge of the electric side
. Maybe he doesn´t know better, has wired the emitters in parallel, or forgotten to configure the bFlex probably. And obviously he hasn´t seen the power of 2.500 lumens before ...Kurzes Fazit in Boardsprache: Der Typ hat eine schöne Lampe gebaut, aber von der Elektrik hat er keine Ahnung. Die Emitter laufen vermutlich mit 350mA und niemals mit 1A, wie er angegeben hat. Entweder er hat die Emitter parallel geschaltet oder vergessen, per UI den maximalen Strom auf 1A zu erhöhen ... keine Ahnung, aber trotzdem schönes Ding
14,4V / 2,4Ah more than 2 hours run time > maximum 14W. Led-lights have a maximum efficiency of 40lm/W so a value of 500lm would be very optimistic, but 2400lm
. And no significant heat after one hour with a casing like this? Don't believe everything you see in the web. It´s also very easy to fake a exif-file...
Oder kurz gesagt: So drall kann das nicht sein.
Da kam mein post etwas zu spät...
. And no significant heat after one hour with a casing like this? Don't believe everything you see in the web. It´s also very easy to fake a exif-file...Oder kurz gesagt: So drall kann das nicht sein.
Da kam mein post etwas zu spät...
doh, all those work - for nothing 
a single quad, running at 1 A, will be way brighter, smaller, lighter and easier to build.
Hopefully he will change the drivers in the future + add a larger battery
a single quad, running at 1 A, will be way brighter, smaller, lighter and easier to build.
Hopefully he will change the drivers in the future + add a larger battery
My conclusions ... this guy is a good mechanic, but has very little knowledge of the electric side
I'm agree
But it is really nice and if works fully well then would an ideal light
Gruss - Saludos
José
Hi another time, here the light work to 3*1 amp
Here your car with the long light
Gruss - Saludos
José
Here your car with the long light
Gruss - Saludos
José
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