6D + BuckPuck 1A + Q5 less than P2D RB100?

[kurni]

What could possibly go wrong?

It's my 1st mod; I use a 6D M@g + DHS + Q5/WH from Erasmus + BuckPuck 1A.

P2D RB100 is definitely brighter on turbo, and it might still be brighter on high if not the same. I test brightness just using my eyes through ceiling bounce and spill beam. Hotspot P2D RB100 is also much brighter.

Alkaline = fresh; heatsink = good (led only slightly warmer than the heatsink, which is slightly warmer than M@g head. I have Arctic silver between Q5 and the heatsink, as well as the heatsink and the body.

I tested using input 5.3v 1A, 5D, 6D, they all produce the same brightness; so definitely regulated.

I don't have any multimeter, I wonder if others might have some ideas about what might have gone wrong.

Many thanks,
Kurni

 

[StefanFS]

You could change the emitter to an SSC P4 US*OH, which have 3.00-3.25 V in forward voltage. SSC P4 also work better with Mäg reflectors. A Mäg with SSC P4 driven at 1A should have about the same output as an MRV Q5 or Tiablo A8/9 with Q5. Some Q5 emitters have been reported to have higher forward voltages, and that together with an unsuitable reflector could produce low output.
Stefan

 

[bluecrow76]

To bad they don't have Harbor Freight down under. They sell decent DMMs for $3 a pop. There's got to be somewhere down there you can find a cheap one. To really know whats going on you need to verify your voltages at the emitter and coming off the switch.

Did you test the emitter and driver before you put everything together?
Have you made sure that the emitter is isolated from the heatsink?

You may have a bad driver, a small short in the switch that was modded, poor conductivity in the M@G body...

Just a couple thoughts... good luck!

I just built a couple of these with Seoul P4's from Kai. Wow! I made one with a Cree Q5/WG and it was amazing when it came to throw, but I didn't like the way it focused our to flood (way to ringy for my taste), so I pulled it off the heatsink and replaced it with a Seoul. I like the ability to go from spot to flood with the Seoul.

 

[kurni]

Thanks for the input guys, I just realised that P2D RB100 has a much narrower reflector than M@g 6D, hence the light is collected better. It's true that P2D RB100 spillbeam is brighter but after a while I realised that my M@g has much bigger spillbeam. I used my camera to ceiling-ounce test in the bathroom, nowhere near accurate but my camera actually says that my M@g is brighter. Perhaps I perceived Rebel's warmer tint as brighter, but I'm guessing that Q5 might actually have more total output.

I just made a fixed lighting using a chocolate can + custom aluminum + copper heatsink + BuckPuck 1000mA with ext. pot; similar brightness & I'm happy with it. I think the driver in my M@g and fixed lighting are OK, as well as the LED; it's just P2D RB100 has a reflector that better suit the LED.

Many thanks,
Kurni

PS: the fixed lighting scares my wife; she always turn it off whenever possible; she says that it doesn't look a like a light but it emits light; she fears it might explode :lolsign:

 

[Nitroz]

The Cree LED does not work well with the stock Mag reflector. It requires a deep reflector to work well.

 

[kurni]

The Cree LED does not work well with the stock Mag reflector. It requires a deep reflector to work well.

Ja; I don't mind the flood; my 1st impression was that the flood was less bright than P2D RB100 but I realised that I got wider flood . My next project would be something with better throw using a few Q5 & deeper reflector.

 

[Gunner12]

Most of the light from the Cree would go into the Spill, as you have observed. the Cree needs a deeper reflector to focus correctly. I'd say remove the reflector and put in a aspheric Lens and make something like this(except much bigger).

 

[ingokl]

Hello kurni,

how does the tint of the Q5 WH to the rebel LED?

best regards

Ingo

 

[kurni]

how does the tint of the Q5 WH to the rebel LED?

Rebel is yellower / greener. The funny thing is that I prefer the yellow / green tint rather than the whiter WH.

Kurni