Aerogarden lighting help!

hey guys, i got an aerogarden and realized they had 2 26 watt cfl bulbs.
I thought it was too weak for later stages so im planning on buying stronger ones

Here's the problem, i dont know what kind of light socket it's called.

Like normal ones would be screw ins but this ones more of a pluggish thing
[attachment=o217650]

Can anyone tell me what bulb this is called?

or where can i buy replacement bulbs that are stronger?

You might want to try posting this in the lighting section.