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Colour cameras are about 50% less sensitive than mono cameras because of the filters that are permanently placed on each pixel.
I honestly doubt that IMX094 reaches 40% QE in Halpha. Even if absolute QE is 70% for pixels with red filter, then this value would need to be divided by 4 because 3/4 of the pixels won't record any useful photons when this colour camera is used with a Halpha filter. I am assuming this chip has a Bayer matrix. So real QE is more like 15% at the most in Halpha for IMX094 that is used in QHY367c or 810a.
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