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  • Overall Rating: 4
  • Price: 5
  • Quality: 5
  • Ease Of Use: 3
  • Usefulness: 3
May require a driver change – Cree XR-E Q5 Emitter on Premium Star (228LM at 1A) Reviews

posted by Yenster on 09/23/2007 Certified Owner

Involvement:General (knows how to use it) - Ownership:1 day to 1 week

Very good quality product with perfect mounting of the LED on the star for heat sinking. Bright LED when properly driven at the correct voltage and current.
Requires a higher voltage driver to achieve the desired brightness.
For those who plan to upgrade from a CREE P4 or Q2, and only plan to replace the emitter, don't be surprised that this Q5 may actually be dimmer. Keep in mind that the performance specs for these emitters are based on the current and must be driven properly. So the existing driver in your flashlight may not satisfy the higher voltage requirements of this Q5. Direct driving with a 3.7V Li-Ion battery (which has about 4.2V when fully charged) will direct drive this emitter at around 1150 mA, and is VERY bright. Be sure to have adequate heat sinking at that current.
A good DIY component to build flashlights. However, upgrading existing flashlights may require additional modifications to the driver to achieve brighter output.


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