Somewhat misleading headline by the Telegraph. This is a proof of concept and doesn&#x27;t really hint at any &quot;return&quot; of incandescent light bulbs unless they reach their efficiency hopes and get them back on the market. Maybe a return in relevance at least?<p>Technically they have not made them more efficient than LEDs yet. Their proof-of-concept reached 6.6% which is still about half of the efficiency of LED bulbs.<p>These new incandescent bulbs can theoretically reach 40% efficiency, but that has not yet been done.