Philips F39t5/850/ho/alto Straight 39w 5000k T5 Fluorescent Light Bulbs

The Philips F39T5/850/HO/ALTO is a high-output linear T5 fluorescent tube designed for bright, efficient lighting in commercial, industrial, and workspace environments. Operating at 39 watts, it produces a crisp 5000K daylight color temperature, ideal for areas requiring clear visibility and accurate color rendering.

These bulbs feature ALTO technology, which reduces mercury content for a more environmentally responsible design while maintaining strong light output and long service life.

• Wattage: 39W (High Output – HO)
• Bulb type: T5 linear fluorescent (miniature bi-pin / G5 base)
• Color temperature: 5000K (bright daylight)
• Light output: ~3500 lumens
• CRI (Color Rendering Index): ~82–85 (good color accuracy)
• Average lifespan: ~25,000–30,000 hours
• Length: approx. 34–36 inches (standard T5 HO size)
• Base type: G5 miniature bi-pin
• Dimmable: No (requires compatible electronic ballast)
• Pack size: Case of 40 bulbs

• Bright daylight illumination (5000K): Ideal for offices, warehouses, garages, retail, and task lighting
• High efficiency: Produces strong light output with relatively low energy consumption
• Slim T5 design: Fits compact fixtures and modern lighting systems
• Eco-friendly (ALTO): Lower mercury content reduces environmental impact
• Long life: Minimizes maintenance and replacement frequency

• Commercial lighting (offices, schools, hospitals)
• Industrial spaces and warehouses
• Retail displays
• Workspaces, garages, and utility areas