Lights like poppy describes will exist. Lighting of the future will utilize multi-spectral-emitters, able to emit a wide range of coherent and incoherent EM radiation from long wave radio waves to short wave gamma rays. Such emitters will find use in anything from household lighting to handheld flashlights and even military laser weapon systems. Such lights are able to focus their "beam" without the need of a focusing lens and are able to steplessly adjust their wavelength within a defined spectrum. This is useful especially for weapon systems, as wide-field microwave lasers for example are particularly effective as a means of crowd control, while narrowly focused infrared to UV lasers are far more effective against a wide variety of inorganic targets and structures at long ranges. All that in a single weapon system.
Household lighting and flashlights will function on the same basic principles, but are mostly limited to the visible spectrum together with UV and Infrared for specialized applications. UV and IF capabilities will be very common in most handheld lighting devices. Most devices in the future will be wirelessly powered by a city- or even nation-wide power net, so batteries and cords will be a thing of the past for most applications. You will seldom find a spot on earth not covered by some power network. Other than that, solid-state graphene batteries will power portable devices that require it, including some flashlights. Such batteries can deliver ludicrously high currents for our standards and sport capacities in the hundreds to thousands of Ah. Portable lighting equipment will mostly be in direct connection with your brain, which, much like poppy already described, allows it to automatically adjust to every situation you might encounter. However, jobs like law enforcement and military will almost exclusively be done by drones and other machines, which do not necessarily require visible light to "see".
Dedicated household lighting will be somewhat obsolete, since most homes will include many hard- and soft-light holographic emitters, which among many other things, can also light rooms. Portable lighting equipment like flashlights exist, but are of limited use to the average citizen as most people in developed nations seldom leave their homes anymore. Holographic networks and internet will connect most places in the world, allowing you to effectively work from home, travel and visit your friends or family in holographic form or online, and spend your vacations and free-time in a custom tailed simulation indistinguishable from relativity.
Just guessing.
No link, and I'm not affiliated. Footprint of a credit card, and runtimes have tested real close to claims.
