The Black Pianta is only available with an E27 screw fitting. It is not available in B22 bayonet.
If you need a B22 fitting, the White Pianta is available in both E27 screw and B22 bayonet fittings.
Pianta 30
The Pianta 30 (our higher-output 30W model) is only available in E27 screw fitting, in both black and white colours.
Summary:
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Black Pianta (18W): E27 only
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White Pianta (18W): E27 or B22
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Black Pianta 30 (30W): E27 only
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White Pianta 30 (30W): E27 only
If you're unsure which fitting you need, E27 is a screw fitting (you twist the bulb in), while B22 is a bayonet fitting (you push and twist to lock).