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There is no direct conversion because they are used to measure two different things. Radiometric units are used to measure radiant energy across the entire spectrum, whereas photometric units are used to measure visible light as preceived by the human eye. As the eye's sensitivity varies across the visible spectrum (being most sensitive to green light, and least sensitive to red and violet light), the conversion between the two systems of measurement varies according to wavelength at which it they are being compared.

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Q: How do you convert the photometric unit to radiometric unit?
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