Killark VM4LC630S5R5G - Supplemental 20KA/10KV Surge Protection is standard for 120-277 VAC models & 10KA/10KV Surge Protection is standard for 347-480 VAC models. Traditional Industrial Appearance, Suitability, and Photometric Performance. Wide variety of optics including globes, globes with reflectors, all-glass refractors, spin-top refractors and flat lens. Swing-Barrel Nut patented tank mounting system. Optional Mounting arrangements including Pendant, Wall, Ceiling, Stanchion and others. VM4L LED Housings can be retrofitted to existing VM splice boxes to upgrade from HID sources. Crisp White Light for Excellent Color Rendering – Chromaticity 5000 K (CCT range) approx. 70 CRI. Energy Savings – less than 130 Watts of Power. Long Life – 50,000 - 55,000 maintenance free hours to 70% initial lumens. Ambient suitability -40°C to 65°C on select models. Instant On – Including after power interruption. World Voltage 120 – 277VAC 50/60Hz. Solder-LESS LED Board Connections – Vibration Resistant. Dual Driver Option (DDR) – For additional energy savings, half of the fixture can be turned off. Solder-LESS LED Board Connections – Vibration Resistant. LM80-08 Measurement of lumen maintenance for LED light sources. LM79-08 Certified “Absolute” Photometry, including Chromaticity Color for Solid State Lighting. L70 Values - Industry Nomenclature for Hours of use to 70% of Initial Lumens (TM-21+ Cal.). Two LED internal heat sink styles » Bulb VM4LB » Concave VM4LC The VM2L/VM4L Series is a low bay and high bay fixture using energy efficient LED's. The design of the VM2LB & VM4LB with the bulb style heat sink creates a light distribution similar to a HID lamp. The design of the VM2LC & VM4LC with the concave style heat sink creates a light distribution with no up light. This fixture is made with a cast copper-free aluminum housing and mount that is suitable for harsh and hazardous environments. With the design of this fixtures internal heat sink keeps a clean look on the outside of the fixture creating a LED fixture that does not contain external heat fins. - Class I, Division 2, Groups A, B, C, D - Class I, Zone 2, Groups IIC, IIB, IIA - Class II, Divisions 1 & 2, Groups E, F, G - Class III, Divisions 1 & 2