Osram T5 tl-buis 6W 640 koelwit G5 225mm

The Osram T5 fluorescent tube in 6W/640 delivers a crisp cool white light with a colour temperature of 4000K, making it a solid choice for task lighting, display cases, and general illumination where clarity matters. Unlike many budget tubes that sacrifice colour consistency, this lamp holds a colour rendering index in the 60–69 range, so colours appear reasonably natural without the harshness of older cool white tubes. Its slim 16mm T5 profile and G5 bi-pin base fit a wide range of modern luminaires, while the 225mm overall length suits compact fixtures.

Highlights

• Cool white 4000K light for focused, alert environments
• 6W power consumption with 280 lumens output
• T5 tubular design, 16mm diameter, G5 base
• Rated lifespan of 8,000 hours
• Energy efficiency class B
• Universal operating position

In daily use

This tube starts quickly—ignition takes less than 0.3 seconds and it reaches 60% brightness in under 10 seconds, so there is no long flicker or warm-up delay. It is not dimmable, which is typical for this class of fluorescent lamp, but the stable output and cool white tone make it reliable for under-cabinet lighting, workshop fixtures, and retail display shelves. With a mercury content of 4.0 mg, it should be disposed of according to local regulations for fluorescent lamps.

Full specifications

• Lamp type: Linear fluorescent, T5
• Base: G5 bi-pin
• Power: 6 W
• Luminous flux: 280 lm
• Colour temperature: 4000 K (cool white)
• Colour rendering index: Ra 60–69
• Dimmable: No
• Rated lifespan: 8,000 h
• Energy efficiency class: B
• Mercury content: 4.0 mg
• Operating position: Universal
• Overall length (incl. pins): 225.1 mm
• Length (excl. pins): 212.1 mm
• Ignition time: < 0.3 s
• Warm-up time (60%): < 10 s
• UV protection: No

Final note

Osram's T5 6W/640 combines compact dimensions with dependable cool white light, ideal for applications where space is limited but performance cannot be compromised.