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The OSRAM T9 40W/840 circular tube is a circular fluorescent tube with 4-pin G10q base, outer diameter 406mm. It emits 3,200lm of cool white light at 4000K (840), with colour rendering Ra 80.
It is the light source for circular ceiling luminaires and wall and ceiling lamps for T9 40W circular tubes, very common in kitchens, bathrooms, cellars, garages, workshops and common areas.
It has no built-in ballast: it works with the luminaire's control gear for T9 40W circular tubes, either a magnetic ballast with starter or an electronic ballast. With a dimmable electronic ballast the light can be dimmed. It replaces T9 40W circular tubes with G10q base and the same colour from other brands, such as Philips TL-E. It is not interchangeable with T5 circular tubes with 2GX13 base. The average life is 7,500 hours.
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