heat your body, not your house -- using an infrared heat lamp - SLRPNK

My goal is to keep central heating turned off as much as possible. I bundle up indoors, which works for the most part but I will struggle when temps drop low enough. And hands in cold air on a keyboard are still a problem regardless. What about using an infrared heat lamp, which traditionally has these use cases: * keeping pet reptiles warm * farms: livestock and incubators * physical therapy for humans (the claims [https://www.infrared-light-therapy.com/infrared-heat-lamp-therapy/]: pain relief, skin healing/repair, blood circulation, anti-aging skin, …) * (atypical) specifically to warm hands on keyboards [https://www.pcgamer.com/the-envavo-heatbuff-is-an-infra-red-lamp-to-keep-your-fingers-warm-as-you-play/] (but the emitted light is white when red would be better so as to not disturb natural night vision) The last bullet inspires some enthusiasm. But I am interested in a DiY project on-the-cheap, buying locally not online. This array of IR LEDs [https://www.nepal.ubuy.com/en/product/59LDJFB5Y-red-light-therapy-device-four-head-infrared-light-therapy-with-stand-15-60-deep-red-light-therapy-lamp-with-660nm-850nm-leds-for?srsltid=AfmBOoovfVk7ODPtqluFEIYAPZOigmWVZAR2x0HqLJZd64QXIjAde0mh] will be hard to buy locally. But the question is, are LEDs even the way to go? That article has a complaint about the LEDs (ironically) having a short life. And a complaint that they do not produce heat anyway. Is that a failure of just that brand and model, or generally a gimick? The temptation is to go cheap on the bulbs, but this ad [https://www.premier1supplies.com/p/heat-lamp-bulbs?srsltid=AfmBOoqkOo1aOT_gtgyq-v78OM0Rx3GpRuekLV9L1Ip42b4NetbeC3Tv] for a heat lamp for lambs is convincing to the contrary. They sell bulbs for $21 that last ~4320 hours. These bulbs [https://bulborama.com/collections/infrared-heat-lamp-bulbs] are claimed to last 6000 hours. What about carbon heating lamps [https://www.hoinfrared.com/]? They look like the basis of space heaters, which are notoriously ineffecient. Though I wonder if the problem is just that people use space heaters to heat a whole room… when perhaps it’s more sensible to have a quite low setting to just keep hands or feet warm. If a typical red filiment bulb is used, is it fair to say a simple dimmer would be useful, such as that of this fixture [https://vetmedicinesdirect.com/home/600-infrared-heatlamp-175w-bulb.html]?