Very pleased – Cree XLamp MC-E K0-WG 370~700-Lumen LED Emitter on 20mm Star Board (MCE-WG-K0) Reviews
posted by techjunkie on 11/05/2008
Involvement:Expert (understands the inner workings) - Ownership:1 day to 1 week
Very white, very bright, very nice upgrade from single die emitter, especially CREE.
Easy to swap a 20mm CREE XR-E star with this MC-E star (if you can solder).
Star is aluminum for good thermal transfer. (Hopefully, emitter slug is soldered directly to aluminum star wihout thermally insulating PCB layer in between, but no way to tell without unassembling.)
Not all emitter leads were soldered together when I received it (see pic in forum). (Not a big deal, but a quality control issue.)
Unique power requirements (3.5v 2.8A in parallel, or 14v 700mA in series) make finding an appropriate regulated buck/boost driver difficult.
Has different focusing requirements than single die CREEs. Not as difficult to focus as an SSC P7, but still challenging, especially with collimator lenses or fraen optics.
Doesn't pull the full 2.8A of current expected. In fact, mine only pulls 1.2A of current from an 8x7135 driver that is capapble of delivering 2.8a.
To avoid a dark spot in the center of the hotspot, sit the emitter lower in the reflector than a single die emitter. Because the star is thicker than most PCB stars, you may have to use gaskets or rings between bezel and head to create space between reflector and star.
If brightness is more important to you than runtime, you will be very pleased with upgrading an existing torch from a single emitter star to this MC-E star, provided you can also supply it with at least 1000mA.
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