Lighting Mod - Engine Bay

ChipsWithDips

Try using a magnetic reed switch. There are a bunch of different types out there, some of them are commonly used in home alarm systems to detect when a window is opened for example.

They can come in a ton of different shapes and sizes.
35-756-BU: Magnetic Proximity Reed Switch: GC Electronics
https://www.sparkfun.com/products/8642
Magnetic / Reed Switches | Mouser

You would want a NC (normally closed) switch, meaning that when there is not a magnet near the switch (hood is open), the switch will be closed or "on".

Although apparently you can turn a NO normally open switch to NC if you use two magnets.
Form B Reed Switch & Permanent Magnet - Parallel Position, Perpendicular Movement

Make sure the one you get is rated for at least as much current as your LED strip requires.

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