The definition of  the beam angle in CKO’s lens is FWHM(Full Width at Half Maximum)  , which is defined by Energy Star, 50% light intensity (D50,half angle).But some customers , especially in China, would like to use D10 to define their lens. It is also called D10. Please refer to the drawing  to see the difference.CKO will modify its standard lens list later to show both half angle (D50) and full angle (D10) later.
FWHM ( Full Width at Half Maximum) : the angle that cd is greater than 50% of the Max cd. Also named D50.
Full Angle (D10) :  The angle that cd is greater than 10% of the Max cd.
Most of them were asked to define in the light pattern.

CKO can use material consigned by our customers to design . Or we can suggest the relative material for different application.For outdoor lighting application, we suggest the PC with F1 grade to resist the UV exposure and moisture immersion.For indoor lighting with high safety spec., PC passing UL94 V2 is the best choice.If you want  a high brightness output and no safety issue, we can use the PMMA to design.


PC: ploycarbonate ; PMMA or named Acrylic
Current only PC with some inclusion can pass the UL 94 V2.
PC reflect more light and Absorb some light if its V2 grade.
PMMA can’t resist at higher temp. , but has higher transmittance and absorb no visible light.


Yes , we have patent on our lens to protect our customers for using them. 
We have patent structure that can guide light backward . This can be used to the omni-directional lamp or candle light ,and those who need the light turn to very big angle.


The phosphor on the LED can change the light to different color. But the distance that light pass through the phosphor will induce color shadings.
With the lens to converge the light will lead to more heavier color shading.
We have patent structure on the lens to make smaller color shading .


Traditional Reflector

70~50% reflectance



CKOs patent structure is not like

common optics that is on the TIR surface


Currently only CREE’s MTG ,Nichia’s 283,and LG’s MCP COB with the bulb cap we provided can pass the energy star omnidirectional spec..
If you change the LED or the bulb cap, then it may not pass the energy star’s spec. but pass the JEL 800-G.
If you consign a LED , we will either slightly change the lens shape ,or change different bulb cap to meet that spec..

TIR is one of the few physical phenomena, which can produce 100% efficiency. Coated reflectors are only as efficient and durable as the coating; no coatings or plating are required on TIR designs;and reflectors are not able to utilize/control the on-axis light.