Hi!
A couple of questions on your post, MH, just to clarify for myself since I'm still working through the practical behaviors of mulitple parallel vs. series LED performance. It seems as though what you are saying in comparing the brightness of the parallel RGGB LED Engine vs the Tri Rebel green, is that there is a marked difference between the brightness of the 2 LED Engine GG dice in parallel vs. the 2 GG dice of the TriRebel running at a lower current. Is this a typical trait of parallel vs. series (i.e. series is brighter proportionally than parallel with regards to current) or is there something else at work in this situation (brighter LED performance based on manufacturer, different lenses, etc)?
My question arises out of an observation that the total foward voltage on the 3 green and 3 blue TriRebels is stated at approx. 10.5 on the Luxeon site, if I recall correctly, so breaking it down into 3 seperate dice is approx 3.5 forward voltage per dice which would seem to indicate that one could, from a voltage point of view, drive the 3 dice in parallel off of a single 3.7 volt Li-ion battery (probably an 18650) so long as sufficient current is able to be discharged by the battery, which would be very attractive from a space conservation perspective in smaller sabers. Am I correct in this (let's assume use of individual resistors for each of a "solid" green or blue color LED set of dice rather than a single driver dividing its total current by 3 among the dice) or is there a hit to the brightness due to the use of the lower voltage parallel setup versus a higher voltage series setup that would invalidate this idea?
My apologies for pulling this back to a basic question of function but hopefully everyone will be patient with me on this, and also my thanks to everyone taking part in this discussion for the information they are sharing.
Johannes