LED desk lamp powered by USB with the ability to adjust the intensity of the light and its rod. Features: Rated power: max. 3.5 W Luminous flux: max 160 lm Color temperature: 5500K cool white Lamp power: DC5V / 0.5A Illumination angle: 110 ° Operating temperature: -10 ° + 45 ° C Power factor:> 0 , 4 Type and quantity of LEDs: 18PCS SMD2835 CRI:> 80 Ra Start-up time: <0.5 S 60% of luminous flux: <1 s 95% of luminous flux: <2 s Lifetime: about 35,000 hours . Number of Ignition: 15,000 IP Rating: IP20 Dimensions: 110x330mm Luminous flux retention factor at the end of the rated life:> 0.7 The lamp is not designed for accent lighting