if i had to guess there are a few reasons they don't do this... the first and most important reason is manufacturers have and will optimize for the main benefi

if i had to guess there are a few reasons they don't do this... the first and most important reason is manufacturers have and will optimize for the main benefit of a product. the main product here is light. heat came as a negative byproduct of traditional incandescent lights and heat is something to minimize to lengthen the life of an led bulb. another possibility is that if it were widespread it could cause some negative outcomes of people sitting too closely to a source of it and potentially exposing the companies to legal issues. not a lawyer and they might be able to shield themselves from that liability with well written disclaimers though. Along with inertia from the incandescent bulbs not emitting that wavelength... the most likely reason is that they don't want to spend the money on researching how safe it is and how to cost effectively make them like that though.