Infinite Flexibility Strong Aluminum clamp opens up to 1.65 width (optimal 0.6-1.38 width) and can be used perfectly with music stands, pianos, office tables, computer desks and headboards. Durable gooseneck design with the length of 50cm/19.7, allows you to adjust your lamp with ease and to direct the light wherever you want. Premium Diffusion Film Adopted Thereve been a small portion of customers who complain about the inadequate light that our previous models emit. We do listen to our customers and have always been looking for ways to increase the brightness. With premium diffusion film invented by SKC Haas from South Korea, weve increased the lamp brightness by 50%. Meanwhile, diffusion films will also increase the angle of visibility by efficiently channeling the light, which leads to a larger lighting area. Flicker-Free, Anti-Glare & Eye Protection Unlike conventional point light source, TROND Halo 9W-C adopts surface lighting source and innovative light guide panel technology, which can create a soft, flicker-free and greatly reduces the formation of shadows. Say Farewell to eye fatigue, and give your eyes a break through long work sessions effortlessly. Specifications: – Material: Premium ABS plastic & Aluminum Alloy – Power Consumption: 9W (max) – CRI Ra: over 82 – Total Flux: 1000 lumen – Color Temperature: 5800K ~ 6000K (daylight) – Illumination: >600lux@30cm (dim), >1200lux@30cm (bright), >1800lux@30cm (brightest) – Lamp Head Size: 8.5cm x 13.5cm / 3.35 x 5.31 – Gooseneck Length: 50Cm / 19.7 (fully-extended) – Clamp Width: 4.2cm / 1.65 (max.), 1.5cm-3.5cm / 0.6-1.38 (optimal) – Operating Temperature: -10? ~ 50? – Weight: 0.9 lb. / 410 g (w/o the power adapter) IMPORTANT: This lamp doesnt have the built-in battery and can ONLY be powered on by the included power adapter.