But thermal and electrical issues at lighting levels of 12,000 lumens and above (a typical 60w household light bulb produces 800 lumens) are barriers to the wider adoption of LED technology.是什么意思_But thermal and electrical issues at lighting levels of 12,000 lumens and above (a typical 60w household light bulb produces 800 lumens) are barriers to the wider adoption of LED technology.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句