All the benefits of the Arcadia bird Lamp, with the convenience of a regular bulb.
The light produced, is of the same spectrum, and same UV content as the fluorescent tube form of the bird lamp, and so it offers all the same benefits to the health and well-being of the birds, but unlike the linear tube, it fits directly into any household bulb socket, meaning that it can easily be mounted over the cage using a suitable standard lamp, or wall mounted lamp fitting.
When a linear fluorescent tube is lit using a standard magnetic ballast, the light is actually not constant, but is pulsing at a high frequency that we cannot detect, but that birds can.
Although there is no evidence that we are aware of that this harmful to birds, many bird-keepers have expressed concerns about this "flicker effect", some likening it to a disco strobe light.
In the case of the Compact bird lamp, such concerns are unnecessary, as the light produced is constant, and the birds cannot detect any flicker.
This energy saving lamp runs at 20Watts, but actually has an output equivalent to a regular 100W bulb.
See here for full details on the importance of lighting to your bird's health
Please note that the Bayonet fitting has been discontinued by Arcadia and is no longer available.