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Daniel what 'kind' of street light is it? The CLS filters only block some of the common older style of urban lighting bandwidths. Many local government areas are moving to replace older lights with LEDS. LED streetlights, while saving money for government, are terrible for astronomy as they are broad spectrum white lights. If it is a LED street light then a CLS will do almost nothing. You could try narrowband imaging, which only allows through Ha, OIII, SII, etc but it requires longer exposures, and makes focusing and framing harder. good luck
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