R2H doesn't seem to be as bright as Q3J ?

[Orion]

R2H doesn\'t seem to be as bright as Q3J ?

I replaced a Q3J with an R2H in a 3 cell flashlight and [using a 30mm optic] and it isn't any brighter, maybe even a hair less bright. Any comments?

BTW, I can't go back to the Q3J because it got messed up. /ubbthreads/images/graemlins/frown.gif

 

[kakster]

Re: R2H doesn\'t seem to be as bright as Q3J ?

I think the R2H's arent exactly "H". Wayne tested some of them and found them to be higher vF than the H specification allows. Mind you, he also said that it should be classed as a 3 bin instead of 2, and id have to agree with him on that.

 

[McGizmo]

Re: R2H doesn\'t seem to be as bright as Q3J ?

Is the light constant current driven or DD or resistored? It may be that you had a stellar Q3J and so so R2H. If the light isn't using a constant current dirver, I would be suspicious that you may have gotten a R2H with a high Vf. It has come out that a few of these were apparently mis binned on Vf criteria.

What is your criteria for "not as bright"? Lux reading, perceived brightness or what? Although not binned by this criteria, radiation patterns also vary from LED to LED and your luminous output may be higher but in a direction which is not optimized by the 30 mm.

- Don

 

[tvodrd]

Re: R2H doesn\'t seem to be as bright as Q3J ?

I had a few that were definately H- make a useful light DD on a CR2. Rest /ubbthreads/images/graemlins/frown.gif . Gotta agree that they are very white, and I would call a 3.

Larry

 

[Bullzeyebill]

Re: R2H doesn\'t seem to be as bright as Q3J ?

I noticed low output on my Blaster 1R when I switched out n3H for R2H.

Bill

 

[BuddTX]

Re: R2H doesn\'t seem to be as bright as Q3J ?

VERY INTERESTING!

A 1 watt with a brighter center than a 5 watt?

WOW

 

[Orion]

Re: R2H doesn\'t seem to be as bright as Q3J ?

The 'test' was just perceived brightness. It's not dim, by any means. Just didn't improve the way I figured an R should have improved it. And about the resistance, I think it is minimal. Probably just 1 ohm.

As far as the color, it doesn't appear towards the green spectrum as the 2 would make one believe. Probably a 2.5 color. /ubbthreads/images/graemlins/smile.gif

 

[Orion]

Re: R2H doesn\'t seem to be as bright as Q3J ?

Okay, I just setup this light the exact same way as a plain old 1 watt LED that I've had for a while and the R2H is definitely not as bright as even the one in the other flashlight. I'm not sure what the bin is for this other flashlight as I've had it for a while now, but it definitely isn't a rare one, . . a blueish tint to boot! I think I may have gotten a bad R2H! I have it in a Blaster II and it's dimmer than it should be. /ubbthreads/images/graemlins/frown.gif

 

[LukeK]

Re: R2H doesn\'t seem to be as bright as Q3J ?

Thanks for playing the luxeon lottery Orion -- you have lost. /ubbthreads/images/graemlins/icon23.gif

 

[yclo]

Re: R2H doesn\'t seem to be as bright as Q3J ?

Initial impressions with two of the R2H's seem only about the same as a Q3J I had, both were running on the same constant current circuit. An eyeball comparison of the white-spot-on-wall test was used. Current draw from battery was about the same too.

-YC

 

[shankus]

Re: R2H doesn\'t seem to be as bright as Q3J ?

I have noticed color and brightness variations in my two R2Hs. One is a very pure white light. The other is a more warm, kind of yellow? light. The warmer one is not as bright as the whiter one. The warmer one is about the same color as my Megaclops SE 5w. Before I got this one R2H, the Megaclops was the whitest LED I had.

The voltage across the whiter luxeon, while on the MadMax+, is about 3.6V. The warmer one measures 3.1V on it's MadMax+.

 

[FalconFX]

Re: R2H doesn\'t seem to be as bright as Q3J ?

...Freakin' lottery... You pay for an R2H and find out your Q3L is a whole lot whiter and brighter (...'ts what happened to my roommate)...
/ubbthreads/images/graemlins/jpshakehead.gif

 

[snakebite]

Re: R2H doesn\'t seem to be as bright as Q3J ?

maybe your q was from the high end for a q and your r is just barely an r =not enough difference to see?

 

[FalconFX]

Re: R2H doesn\'t seem to be as bright as Q3J ?

Yeah, I'm suspecting he just got a spiked Q3 and a so-so R2...

 

[McGizmo]

Re: R2H doesn\'t seem to be as bright as Q3J ?

The Luxeons are measured in an integrating sphere which catches all light, regardless of directivity. The radiation pattern can vary considerably in the LED's, or so I have been told. If you get a LED that pumps out much of its photons close to the axis, these photons will end up in the spill beam and not the reflected beam. It's just another aspect to the unique character of each one of these guys.

- Don