FirstDsent
Enlightened
Four of the Rebel dice in a single package like the Luxeon V would be sweet! Can we hope?
Bernie
Bernie
Yeah, I agree but nobody packages a single LED with the kind of output that you could get with 4 x 200 lumen dice in one package. Consider that all standard Luxeon optics would work with such an emitter, and the Vf wouldn't be substantially higher if at all than the current Lux Vs (would it?). Then you can have up to 800 lumens in a standard flashlight.Lumileds used 4 dice in the Luxeon V to solve 2 problems:
1) They wanted to get 120 lumens from a single LED. Given the efficiency of white LEDs at the time this required four or five watts.
2) The dice of the time were not able to handle being driven at much more than 1 watt, so they needed four of them.
Both problems have long since been solved. All modern LEDs like the Cree XR-E, Seoul P4, and Rebel can be driven at power levels of 3 or 4 watts. Furthermore, they are much more efficient, and so are capable of emitting upwards of 225 lumens at maximum rated current. Since the problems the Luxeon V was created to solve no longer exist, there is no good reason to have a 4-die LED.
Note that the white Luxeon V had severe lifetime issues due to the inability to totally match Vf among the dice. It was/is also much higher in price due to the extra manufacturing steps. At best the Luxeon V was simply a stopgap measure. Technology has marched on. There is no need for mounting multiple dice in a single package any more. Even if there were, a series arrangement rather than a series-parallel arrangement would create the fewest problems.