How do I know if I have halogen light bulbs or LEDs?
Dottie Harding, via email  The simplest way to check is to remove the lightbulb, ensuring it has been turned off and has cooled down (old halogen bulbs get exceptionally hot). Lightbulbs by law must be marked with certain information so the end user knows what replacement parts they need. If you are lucky the bulb will say halogen or LED, but this is not a legal requirement, just good practice. If it does not, it must display the power in the form of wattage. Generally anything over 10W will most likely be halogen (25W, 50W etc) and anything under 10W would be LED. If you are still unsure, any reputable professional in the