The G4's with 6 LED's are not as bright as  the halogens. They give off a warm off white light. Quite adequate .Just make sure you get the polarity right.Pull the wiring out of the overhead until you find the two spade connectors.  I had to reverse a few.  On the back of the light fitting there is a panel that can be levered off,allowing you to hold the fitting and lamp holder together while inserting the 2 pins of the G4......some needed some pressure to get them in. At $1.00 ea plus $1.49 S&H I have a few that dont work but at that price who cares!! There are quite a few Hong Kong based suppliers on EBay.

As I posted in a different thread, I ended up buying LED under cabinet lights at Lowes because I'm having an electrical problem with the circuit that feeds my built-in lights.  I'm so glad we did this I'll probably only resolve my circuit problem just to make sure I don't have a short circuit, but the new lights are so superior to the old ones that we won't be taking them down.

The fixtures are very similar in appearance to the fluorescent under cabinet lights that most of us have bought one time or another over the past several decades.  These are thinner and do not show behind the lip of the cabinet.  They come in different lengths and can be wired together so they use a single switch.  When packaged the fixtures bear a nondescript brand name, but when I unwrapped them they say Kitchler on the back, which is a major fixture manufacturer.

These are the most impressive LED lights I have yet seen.  The color temperature is white, not blue.  They are extremely bright compared with what the built-in lights provided.  We have a 10" and an 18" fixture which together draw about 13 watts.  Using a 5 to 1 ratio compared to incandescent bulbs, this would be the equivalent of about 65 watts and I would definitely believe it.  On the days when our built-in fixtures decide to work, their light output seems downright puny when compared to these.

In summary, I may buy LED bulbs to replace the halogens and use them as nightlights.  Now that my DW has experienced these bright task lights, she's never going to want to give them up.

I purchased these bulbs 10w/T3 bulbs at Lowe's for $5.96. These are a stock item at most Lowe's Home Improvement centers.