You can use whatever you want. Buutt. I’ve been using LEDs and CFLs for years. They use less electricity, run cooler and last longer than incandescent. I have one pair of LEDs used for outside porch lights that have run 24/7 since 2013. They burn 24 watts but have the output of 100s. Big money savers. The cheap WM LEDs don’t last long enough to justify the cost imo so I shop around. I have a few CFLs that have been running since 2007.
No , that’s actually the point.
I can’t use whatever I want.
Actually, they put out less than 24 watts. A much bigger percentage of their output goes to visible light than for incandescent bulbs.