Efficient (filament) bulb with an optical filter

The light generating system, featuring LED filaments and solid state light sources within a transmissive enclosure and an optical filter, addresses the inefficiencies and spectral control challenges of existing systems by enhancing energy efficiency, lumen output, and color tunability.

WO2025056359A1 Publication Date: 2025-03-20SIGNIFY HOLDING BV
7 Cites 0 Cited by

Patent Information

Application Number
PCT/EP2024/074512
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-09-14
Filing Date
2024-09-03
Publication Date
2025-03-20

AI Technical Summary

Technical Problem

Existing light generating systems with solid state light sources have relatively low energy efficiency, requiring higher power consumption to achieve a desired lumen output, and struggle with controlling spectral properties and brightness/dimmability.

Method used

A light generating system comprising one or more first LED filaments and one or more second solid state light sources, housed within a light transmissive enclosure, and an optical filter that is transmissive for part of the first device light and reflective or absorptive for part of the second device light, particularly in the blue-green wavelength range.

Benefits of technology

The system achieves higher energy efficiency by increasing light intensity without proportional power consumption, providing higher lumen output at lower wattage, and allows for tunable color and dimmability through the use of different light sources and the optical filter.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention provides a light generating system (1000) comprising (i) one or more first light generating devices (110), one or more second light generating devices (120), a light transmissive enclosure (500), and an optical filter (550), wherein: (I) the light transmissive enclosure (500) comprises a light transmissive material (505), wherein the light transmissive enclosure (500) comprises an upstream face (501) and a downstream face (502); wherein the light transmissive enclosure (500) defines an enclosure volume (507); (II) the one or more first light generating devices (110) are at least partly configured in the enclosure volume (507); wherein the one or more first light generating devices (110) are configured to generate first device light (111) having intensity at one or more wavelengths in the visible wavelength range; wherein the one or more first light generating devices (110) comprise one or more LED filaments (115) (and wherein the first device light (111) comprises filament light); (III) the one or more second light generating devices (120) comprise one or more solid state light sources; wherein the one or more second light generating devices (120) are configured to generate second device light (121) having intensity at one or more wavelengths in the visible wavelength range, including at least one or more wavelengths in the blue-green wavelength range; (IV) the optical filter (550) comprises a dichroic filter; wherein the optical filter (550) is configured within the enclosure (500); wherein the optical filter (550) is transmissive for at least part of the first device light (111) and reflective for at least part of the second device light (121) (in the blue-green wavelength range); wherein the one or more second light generating devices (120) are configured such that at least part of the second device light (121) ) (in the blue-green wavelength range) is reflected at the optical filter (550) in a direction away from the one or more first light generating devices (110); and (V) the light generating system (1000) is configured to generate system light (1001) comprising one or more of (i) at least part of the first device light (111), and (ii) at least part of the second device light (121); and wherein the light generating system (1000) is configured such that in a first operational mode of the light generating system (1000) the system light (1001) is white light having a correlated color temperature in a range from 1500K to 6500K.
Need to check novelty before this filing date? Find Prior Art