My shield modification deals with the lack of cut off. If you want a hard cut off then paint the shield flat black. but if you want to reuse the blocked light then keep the mirror finish of the aluminum. You will then have some light scatter. It is important to keep the reflective shield as close to the low beam led as possible to keep a tight beam. I am adding a drawing of the basic dimensions. I have made a few using aluminum from a soda can. The mounting holes I drill with a 0.087 inch drill. I am hoping that many of you will try this and report your results back here. Most of the light leak is off the back of the bottom of the shield where it runs into the high beam led. But, as is, it provides a significant improvement that makes these Leds very useable with minimal glare to opposing traffic on road. Fold on dotted line and cut the solid lines. You will have to trim to fit.
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Please try it and let us know what you think!