Have you thought of using water-clear Stormsure polyurethane adhesive on your chipped lens? Tis very tough and better than clear silicone sealer. Alternatively, a UV-cured windscreen crack sealer such as sold by Loctite et al? I don't mean to undermine Gary's efforts to achieve the perfect headlamp cos he's a good mate and gave me his surplus Bosch!
Nick
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