
Very bright as long as it works well. No idea of lifespan or energy efficiency. Note that his bulb has a 1.54" E39/E40 screw in the base and will NOT fit the standard bulb socket screw which is E26/E27. I have an E26/E27 to E39/E40 adapter Bought a JESLED Medium E26/E27 to Mogul E39/E40 Adapter with Corncob LED Bulb Socket from Revain ($9.99) from Jesled (4-pack) for large base mogul bulbs. / 4 packs) and it worked great Remember that the adapter is about 2" long and this increases the likelihood of lamp gap issues if you have a low ceiling so add the lamp length and the adapter length together and make sure Don't break your head. Hope this helps!

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