Both visible or invisible, such as illumination for my roll-top desk's work area, hidden from view, it captures the same feel of the single filament incandescent bulb with which the desk originally came 40 years ago. True to form, the bulb almost looks as though it went through a time machine to arrive at my door. Remember these for your desks, china cabinets, bars, and even those trendy chandeliers and even that dining table lighting.