... safety.Bad occlusion ,Damp air will cause short circuit kindling inside the bulb,which will trigger danger when the bulb ... on a moving train or vessel.The bulb will not be destroyed on the way of march,,even ... liquid-cooled LED globular bulb has an extremely long life. It applied covering LED illuminant bodies which ... hours per day on average,the bulb can last at least 30 years.The liquid-cooled LED ...