I have a LED Halogen By Brinkmann and I need a replacement halogen blub.

Not 100% sure but I suspect the LED replacements exhibit a significantly higher impedance when off, unlike incandescent and halogen.

If you have multiple cans controlled by one switch, try changing all but one to LED and likely there will be no flicker at the lighted switch.

If you leave at least one halogen on the circuit and it still flickers, be sure to comment here and I'll research further.

Halogen work with AC or DC voltage ... 12 volt LED bulbs are DC.
Check that transformer delivers DC, or buy 100 watt IP67 LED driver.
Keep in mind the lutron DV-600 is rated for incandescent and halogen loads, and may not function as expected when connected to inductive load like transformer or driver.

These Halogen bulbs are inefficient, and run so hot that they often damage the reflector and bulb socket if they are left on too long. Fortunately there is an easy fix for this. At most stores that sell the exact replacement Halogen bulbs (Lowes, Home Depot and others) you will see a selection of LED bulbs on the same display rack that will fit into the same socket the Halogen bulbs use. It is IMPORTANT that you know the code number stamped on the base of your Halogen bulb AND its voltage because some Halogen bulbs are 12 volts and some are 110 volts. If you can't read the labeling on the bulb, look for the wiring diagram usually glued inside the range hood or look in your owner's manual. Once you know your Halogen bulb's code number, look at the packages that the LED replacements come in. There will be a list of Halogen bulb code numbers that the LEDs are meant to replace. The male sockets on these LED replacements will be shaped just like the sockets on your original Halogen bulbs so they will plug in easily. However, just like LEDs bulbs that replace the old incandescent bulbs in your table lamps or ceiling sockets, they have an electronic section included in there base to run the LEDs and it makes the LED bulb slightly longer than the much simpler Halogen bulb. For my stove hood it meant that the bulb would not quite fit into the reflector in the hood. I had to use a Dremel tool to remove a bit of the reflector to get a proper fit. The LED bulb is just as bright but runs SO much cooler and uses so much less electricity that now I can use the range hood as a night light in the kitchen. I never felt safe doing that with the two Halogen bulbs since they ran so hot that they were burning the fixture that held them in the stainless steel hood and were melting the wiring entering the socket base. This upgrade to your range hood is well worth the effort.

If you are speaking of recessed lights, conversion kits are available that just screw in to replace the halogen lamp. As to wattage, it would depend on what you mean by decent light. If the existing level is ok, just purchase the corresponding led equivalent.

Hi Sandie
You are asking about a Microwave oven...right?
They usually don't use halogen bulbs. Just a standard incandescent bulb. Don't need super bright in Microwave oven.
Take the bulb out and note the Voltage, Wattage and Shape & Size of the base. Bayonet or Screw etc. some details may be stamped on bulb.
Replacements can be had from many sources. Hardware / Electronics... depends where you are.

If the bulb is halogen for a vehicle headlight for example... take original or photo to an automotive shop.
Good Luck

Just look this youtube video, and it can't be more clear.
Don't forget to unplug the hood, or switch it of. Although the halogen lamps are only 12 volt. In the hood are dangerous voltages. How to replace cooker hood halogen bulb or lamp

These Halogen bulbs are inefficient, and run so hot that they often damage the reflector and bulb socket if they are left on too long. Fortunately there is an easy fix for this. At most stores that sell the exact replacement Halogen bulbs (Lowes, Home Depot and others) you will see a selection of LED bulbs on the same display rack that will fit into the same socket the Halogen bulbs use. It is IMPORTANT that you know the code number stamped on the base of your Halogen bulb AND its voltage because some Halogen bulbs are 12 volts and some are 110 volts. If you can't read the labeling on the bulb, look for the wiring diagram usually glued inside the range hood or look in your owner's manual. Once you know your Halogen bulb's code number, look at the packages that the LED replacements come in. There will be a list of Halogen bulb code numbers that the LEDs are meant to replace. The male sockets on these LED replacements will be shaped just like the sockets on your original Halogen bulbs so they will plug in easily. However, just like LEDs bulbs that replace the old incandescent bulbs in your table lamps or ceiling sockets, they have an electronic section included in there base to run the LEDs and it makes the LED bulb slightly longer than the much simpler Halogen bulb. For my stove hood it meant that the bulb would not quite fit into the reflector in the hood. I had to use a Dremel tool to remove a bit of the reflector to get a proper fit. The LED bulb runs SO much cooler and uses so much less electricity that now I can use the range hood as a night light in the kitchen. I never felt safe doing that with the two Halogen bulbs since they ran so hot that they were burning the fixture that held them in the stainless steel hood and were melting the wiring entering the socket base. This upgrade to your range hood is well worth the effort.

are you using one of those florescent bulbs? They generally can't be dimmed.

This dimmer was not made to dim a load smaller than 40VA. That halogen bulb would only have been 20VA or so.

http://www.lutron.com/cms400/PageBuyNow.aspx?id=16977&mn=1815

I think that when your bulb burnt out, the dimmer over-volted the transformer and smoked it. That said, I think you have a fixture problem and, possibly, a switch problem, too.