Related: Replacing incandescent light bulbs with LEDs - nowadays LEDs have about 95-99% of the warmness profile of an incandescent and are relatively cheap (can result in &lt;1y ROI), but people still keep buying incandescents.<p>Another related:  NiMH slow-discharge batteries (Eneloop) are very good, last as long in a remote control, and have more consistent charge levels than an alkaline.  Yet people (even enviro-conscious relatives) keep buying alkalines.  Why?