Are there LED lamps available for ovens?
As already stated, LEDs can't take the heat. In addition:

Many ovens use halogen bulbs instead of &quot;ordinary&quot; incandescent bulbs. These are a type of incandescent light with two key differences: size and heat.
The size is irrelevant for most ordinary lamps but great for an oven, where you want something small so that it won't take away from valuable interior cooking space.
The heat is a huge problem for ordinary lamps, to the extent that there were major recalls/design changes many years ago because of halogen lamps setting curtains and other stuff on fire, resulting in metal grid covers for those lamps and eventually they disappeared altogether in favor of much more efficient CFL and then LED lamps. But heat is perfectly fine in an oven, where you have a high-but-regulated temperature. If you have the light on while cooking and it puts a few extra watts of heat into the oven, the element will turn off a few seconds earlier and the net energy usage is a big fat 0.

In general with any lighting system, the efficiency is a balance between light and heat. All the energy not turned into light becomes heat. In an oven that is perfectly fine and useful instead of wasteful. For an extreme example of this, where the light bulb is the heating element, see the Easy Bake Oven. In fact, for a conventional electric oven, heat generated from a light bulb is essentially the same efficiency as heat generated from heating elements. Where energy usage is a bit different is with microwave ovens and gas ovens.