Do your E27 light bulbs have a diffusing surface?

Do your E27 light bulbs have a diffusing surface? I get the impression from the picture that this is the case, but I see no mention in the description. May I ask these two more general questions: 1) I heard that the diffusing eats up around 25% of the light (lumens). Is that true ?, 2) If I have the choice between ceiling-flooding and bulbs (with diffusing surface) in plain sight, is one less eye-straining, or is it the same? 

Our A60 E27 light bulbs utilize a diffuser cover to help distribute the light in an omnidirectional manner and further reduce glare. You are correct, however, that the diffuser does reduce the amount of brightness due to transmission losses. We estimate the loss to be between 10-20%.

We generally recommend using lamps with diffusers for all indoor lighting applications, as the bare LED emitters do provide very high intensity and may be uncomfortable when looked at directly.