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Glossary and Frequently Asked Questions
In this section there mainly to explain some basic issues, and even some white issue. Lest we send new people to keep repeating this post to ask a question.

Q: P4 Q5 What is the difference?
A: Q5 higher luminous efficiency than the P4.

Q: how to distinguish between P4 Q5, if I buy the Q5, P4 me how to do business?
A: This problem is a lot of new people have asked, and how to distinguish between P4 Q5.
CREE LED start with distinction under way now, its all the same production line production, produced by the LED has a certain degree of dispersion, and then produced by the LED on the luminous efficiency based on the classification, so that has been introduced from P3 to R2 of the variety of levels, these levels themselves have a certain range, that is the same level of luminous efficiency Q5 also divided. So now very clear that if in the absence of power is the fundamental premise of the test can not be resolved by the naked eye, the human eye changes with dozens of LM is not obvious, of course, does not rule out the possibility of your eyes in particular.
Q5 also understand that the VF (VF meaning explained in more detail later) to be high, VF is not low Q5, this idea is unfounded. CREE company for LED luminous efficiency of the classification by the classification are not classified according to VF.

Q: Q5 WH and Q5 WC is, what is difference between the two, Q3 5C it?
A: WH and WC Q5-level cool white LED is the light of specific colors of light and color comparison chart shown below, simply say WH is the warmest cold light color white LED, WC is being white LED. WH is a light color eyes seem to "yellow" more.
Q3 5C refers to the natural white color of the LED light color chart below a specific figure

Q: VF value is what?
A: LED is a current need for constant work, constant work in the current work is the LED's forward voltage drop VF values, LED has its own individual differences, and now widely used are based on CREE LED luminous efficiency to distinguish, and that distinction is itself an interval, there is no nominal value of VF, so the existence of the VF values are generally discrete, this still has some luck with your relationship, in fact, my personal point of view, now largely have adopted a buck circuit. My level of interest in small VF.


May be on the top part of the distinction between Q5 P4 more about the professional term, is not very easy to understand. Now add the specific interpretation of the power-on test is the power for a constant current through the pass and then the amount of light for specific distinction. Q5 amount of light than the P4's pass higher.
The earlier the discrete level, is itself, this level is a certain range, such as the P4 is the 80.6-87.4 and 87.4-93.9 Q2 is that most "light" of the P4 and the most "dark" Q2 differences is very small.

LED description on the basic core here, and what problems can be continued. Continue to add