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30w & 40w Corn Lamps
Shop our collection of 30W and 40W LED corn lamps, designed for medium-sized spaces that require powerful yet energy-efficient lighting. These retrofit bulbs deliver robust 360° illumination, making them ideal replacements for outdated CFL, SON, or metal halide lamps in locations such as workshops, warehouses, stairwells, plant rooms, and retail back-of-house areas. Available in both E27 and E40 base types, these lamps offer a straightforward upgrade path to reduce power usage while boosting light output and reliability.
With high lumen efficacy and long operating lifespans, these LED corn bulbs provide an excellent return on investment, especially in areas with extended daily usage. Their instant-on performance, durable design, and low maintenance requirements make them perfect for demanding environments where safety, visibility, and efficiency are key. All models are sourced from leading manufacturers and backed by LampShopOnline’s expert service and fast UK delivery.
30W & 40W LED Corn Lamps | E27 & E40 Energy-Saving Bulbs
FAQ's
A: 30W and 40W LED corn lamps are ideal for medium-sized spaces that require reliable, high-output lighting with full 360° distribution. These include workshops, plant rooms, corridors, stairwells, loading areas, and retail storerooms, where traditional CFL or SON lamps are still in use. Their compact yet powerful design makes them a popular upgrade for fittings where both space and performance are considerations.
They serve as an excellent retrofit solution for existing fixtures with E27 or E40 bases, delivering significantly reduced energy usage while maintaining or improving overall light levels. Thanks to their instant start-up, low heat output, and long operational life, they’re especially effective in areas that require consistent lighting throughout the day or in safety-critical zones.
A: Many 30W and 40W LED corn lamps are suitable for use in enclosed or partially enclosed fittings, particularly if they are rated IP65 or higher. These lamps are often installed in outdoor applications, utility spaces, or dust-prone environments, so thermal performance and ingress protection are key. Always refer to the manufacturer’s product specification before installation.
Because of their higher wattage compared to smaller corn lamps, heat management is more critical — especially in fully enclosed fittings. Models that feature aluminium heat sinks, integrated fans, or advanced thermal regulation are best suited for these conditions. LampShopOnline clearly highlights whether each product is enclosure-rated and can assist with choosing the best lamp for more demanding settings.
A: The choice between E27 and E40 base types depends on the existing fitting you’re upgrading. E27 (27mm screw cap) is standard in smaller commercial fixtures, while E40 (40mm screw cap) is typically used in larger, industrial-grade fittings such as low bay or high bay luminaires. Both base options are available across our 30W and 40W LED corn lamp range.
Before purchasing, it’s essential to check your existing fitting’s cap size. Choosing the correct base ensures a quick retrofit without adaptors or rewiring. If you're replacing an older SON, metal halide, or CFL lamp, the cap type and fitting size will determine which corn lamp is compatible. Our team at LampShopOnline can help you confirm compatibility and select the most efficient lamp for your specific needs.