Oops .. nearly fell at the last fence there.
Those ones are T10.
You mean these ..
https://www.ebay.co.uk/itm/Super-Bri...8AAOSwtqRbeb~Y
They're rated at 0.12W which doesn't sound much but in this case its a genuine power figure not a brightness equivalent I guess ... and they claim 4 lumens, though I have no comparative info on the original bulbs.