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· Updated Aug 4, 2026
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When the power goes out or a critical security system fails, the reliability of your lighting becomes more than just a matter of convenience—it becomes a matter of safety. PAR38 backup light bulbs are specialized components designed to provide high-output illumination during emergency situations. Unlike standard household bulbs, these are often integrated into emergency egress fixtures, security lighting, or backup power systems where consistency and durability are non-negotiable. Selecting the right bulb requires a technical understanding of how these lights interface with backup power supplies and the specific environmental conditions of your installation site.
Editor's Choice
Our Top Picks for Par38 Back Up Light Bulbs
The three standouts our editors recommend first — ranked by performance, value, and real-world reviews.
3000K Soft White and Energy Saving: 100-watt replacement uses only 11.5 watts of energy and produces about 1050 lumens of light, saving more than 80% electricity bill compared with equivalent traditional bulbs. Motion sensor light gives off a soft white glow, 3000 Kelvin, often yellow in appearance. Best for living rooms, dining rooms, bedrooms, and outdoor spaces.
Motion Sensor Outdoor Lighting: The 4th generation of Sengled PAR38 Motion Sensor Outdoor Light built-in high-quality PIR motion sensor. It will automatically light on and last for about 90 seconds in dark conditions when the moving object is detected at a certain range, whether moving objects are humans, cars, or animals. It can act as a security light by installing a camera beside it to keep your home safe at night.
Auto ON/OFF and Always On Mode: Motion sensor light bulbs built-in Photocell Sensor, which enables the bulb to stay off during the day and automatically light up when movement is detected at night. Or, by quickly flipping the power switch off and back on within one second, you can turn the Motion Detection Mode to Always On Mode. This enables the LED bulb to stay on in dark environments, just like an ordinary bulb, regardless of whether the movement is detected. More convenient and practical for both indoor-outdoor use.
UL Wet Listed Certified: Rated for Wet Locations, the Sengled PAR38 motion activated light is ok to hang where it will come into direct contact with water. Motion detector lights for outside uses waterproof seals to protect internal components from moisture. Outdoors in the rain is fine.
Easy to Install and Handy Customer Service: The Sengled PAR38 Motion detector light bulb is the same size and shape as the PAR38 Halogen Floodlight bulb. Easy to install and transform your existing outdoor LED floodlights into motion-activated lights without the extra hardware or expense. The Sengled US-based team will offer you technical support and customer service whenever you need it.
Eliminating the need for expensive, hardwired security lighting systems is exactly what these Sengled PAR38 bulbs achieve. I found that upgrading existing fixtures is incredibly simple since they use the standard E26 base, essentially turning any basic porch or driveway light into a smart security tool. The 4th generation PIR sensor is impressively responsive, triggering 1050 lumens of warm 3000K light for 90 seconds whenever it detects movement from people or animals. I particularly like the dual-mode flexibility. You can stick to automatic motion detection or use a quick switch flick to keep them on constantly. Since they are UL Wet Listed, you don't have to worry about heavy rain compromising the internal components, making them a reliable, energy-efficient choice for any outdoor perimeter.
Grow your plants year round: These grow light bulbs mimic the sun’s spectrum and provide the perfect high-quality plant light that will allow your indoor garden to bloom and flourish year round, helping grow strong and vibrant plants.
Plant light bulbs at 4000K: Perfect for plants, easy on your eyes without harsh or unsightly lighting. Lonwon plant light bulb for indoor plants provides a pleasing, natural light, temperature that integrates well with any decorative aesthetic.
Long-lasting, energy saving led grow bulb: The Lonwon grow bulbs for indoor plants feature advanced LED technology that uses only 30 watts of energy (150-watt equivalent), Each light bulb is expected to deliver a lifetime of up to 50, 000 hours of light (based on three hours per day), saving you the cost of frequent bulb replacement
Grow light with advanced red spectrum for flowers and fruit: The grow bulbs have a red light spectrum that is perfect for tomatoes, cucumbers, peppers, flowers, fruit trees succulents, house plants, seed starting, vegetable, orchids, cacti during their fruiting or flowering growth stage.
Full spectrum grow light bulb: Lonwon Grow light bulbs were carefully designed to give your plants the most light with a high output PPFD of 1313 umol/m2.s. Now you can grow any variety of plants in your garden.
Compatibility: these Lonwon LED grow light bulbs fit in E26 medium screw bases, no startup delay.
Peace of mind on your purchase: our support team is here for you 24/7. Money back without any question within 90 days of purchase. It's the clear choice when choosing an led grow light bulb here!
The Lonwon 30W LED grow bulb delivers a massive 1313 umol/m2.s PPFD output that turns any standard lamp into a high-performance indoor garden. I was particularly impressed by the 4000K color temperature. Unlike those harsh, purple-tinted lights that ruin your living room's vibe, this bulb provides a natural, pleasing light that is easy on the eyes while still mimicking the sun's spectrum. It is a powerhouse for flowering and fruiting stages, specifically utilizing an advanced red spectrum to support tomatoes, peppers, and orchids. You get the punch of a 150-watt bulb while only drawing 30 watts of energy, and with a 50,000-hour lifespan, you won't be constantly swapping out replacements. It fits standard E26 bases perfectly with zero startup delay, making it a seamless upgrade for any indoor plant enthusiast.
Energy Saving Bulb. Save money on electric bills by using these energy-saving LED light bulbs. A perfect replacement to incandescent lights, these low, 10 wattage LED bulbs (100-watt equivalent) use less energy and endure longer, saving you money on electric and replacement costs.
Insect-Free Lighting. Relax on your back porch or deck in the middle of summer without being bothered by pesky insects. The yellow bug flood light bulb gives off amber yellow lighting, illuminating your Front porch or patio our Garage while keeping insects at bay.
Long Lifespan. Besides saving you money on energy costs, these spot light boast a longer lifespan to reduce the cost and hassle of renewing them. These lamps can last up to 30,000 hours, making them virtually maintenance-free.
Just Right Brightness. These bulbs produce a spectacular yellow light with the perfect amount of brightness so you can see in the nighttime hours. They’re ideal for an outdoor porch, deck, garage and entryway, as well as for indoor lighting to help you feel more relaxed and improve sleep.
Safe Alternative. Unlike halogen bubs, these LED lights do not contain mercury and won't release any hazardous gasses. As such, there's no need to worry if a bulb breaks or about having to recycle it.
Sitting on your back deck during a humid summer evening shouldn't feel like a battle against a swarm of mosquitoes. These Bluex Bulbs PAR38 amber flood lights transform your outdoor space by providing a warm, spectacular yellow glow that keeps pesky insects at bay. I found the 10W output provides a perfect 100W equivalent brightness, making them ideal for illuminating entryways, garages, or patios without the harsh glare of standard white light. Because they are LED, you aren't just getting insect-free lighting. You're getting a mercury-free, energy-efficient alternative that lasts up to 30,000 hours. It is a massive relief to swap out old, hot halogen bulbs for something that stays cool and helps you actually relax under the stars.
Sensitive PIR Infrared Motion Sensor: Sengled outdoor motion sensor light bulb has built-in high-quality PIR motion sensors. It will automatically light on and last for about 90 seconds in dark conditions when the moving object is detected at a certain range. The detection range is about 23 FT and 100° wide angle.
Auto ON/OFF & Always On Mode: Motion sensor light bulbs built-in Photocell Sensor, which enables the bulb to stay off during the day and automatically light up when movement is detected at night. Or, by quickly flipping the power switch off and back on within one second, you can turn the Motion Detection Mode to Always On Mode. This enables the LED bulb to stay on in dark environments, just like an ordinary bulb, regardless of whether the movement is detected.
Comfortable Lighting: This motion sensor lights outdoor bulb gives off a comfortable daylight white 3000 Kelvin brightness. It's a bright led bulb and with a high CRI 80+ which makes your eyes more comfortable and makes the object more real to be seen. No glare, no flicker, and no dim anymore. It is suitable for indoor/outdoor use.
Ultra Bright & Energy Saving: Sengled motion-activated light bulb would only turn on when the ambient is in darkness and would continue lighting for about 90 secs after the motion ceased. This energy-efficient design avoids wasting electricity. This motion flood light costs 14.5 watts of energy consumption and output 1500 lumens of light, 150w equivalent, which achieves a great cost reduction.
Easy to Install & Usage Occasion: As easy to install as screwing any other motion sensor bulb, no extra wire or tools. Just screw the light bulb motion sensor into your existing E26 base. This great motion sensor flood light, outdoor motion lights for the porch, under eaves, driveways, and outside.
Sengled has engineered a highly practical solution for home security with these motion-activated PAR38 LED bulbs that bridge the gap between simple lighting and smart automation. After testing the PIR infrared sensors, I found the 23-foot detection range and 100-degree wide angle to be impressively responsive in dark conditions. The 3000K warm white light provides a comfortable, flicker-free glow with a high CRI of 80+, ensuring your porch or driveway looks natural rather than harsh. I particularly liked the dual-mode flexibility. You can stick to the energy-saving motion mode or quickly toggle to an 'always on' setting by flipping the power switch. It is a seamless, tool-free upgrade for any standard E26 base that delivers massive 1500-lumen brightness without the heavy energy draw of traditional floodlights.
LUXRITE Dusk to Dawn PAR38 LED Bulb, 120W Equivalent, Automatic On Off Sensor, 5000K Bright White, 1250 Lumens, Wet Rated, Outdoor Security Spotlight,...
DUSK TO DAWN - Automatically have your outdoor light bulbs turn on and off depending on the time of day. These dusk to dawn light bulbs sense when it starts to get dark and will turn on instantly. When the sun comes up, they will turn back off and conserve energy. No hands on action needed to control your exterior lights. You will have the convenience and safety knowing your lights are providing bright light even when you are not home.
BUILT TOUGH - Each PAR38 dusk to dawn outdoor light bulb is constructed to handle the harsh outdoors to continue producing light to your home. With the wet location rating, these light sensing bulbs can be directly exposed to rain and water without issues. Use them in your security flood light fixtures, ground stakes as up lights, backyard, front entryway, soffits and under eaves, and more.
SAVE ENERGY - The ideal way to conserve energy with a dusk to dawn led flood light bulb with automatic light sensor that turn off during the day and turn on at night. Each LED PAR38 bulb uses only 15W of power to replace standard 120W incandescent lights, which saves you 87% on your electricity and lasts 10x longer.
CONTINUOUS LIGHT - Built with an astounding 25,000 hours of lifetime which means no replacement will be needed for the next 22 years. You can trust that each photocell light bulb will continue working to provide light to your home year after year. Use these dusk to dawn outdoor lighting bulbs for your recessed ceiling can, driveway, garage, patio, and more.
RELIABLE LIGHTING - Zero flickering light, zero delay, and zero worries with a dusk to dawn LED bulb that provides high quality light to your interior or exterior. Each sun sensing light bulb features a dusk to dawn photocell sensor, comes UL listed for your safety, wet rated for reliability, has a 40° beam angle, and is backed by a 3 year warranty.
You might assume a light bulb with a built-in sensor is just another gadget destined to fail after one rainy season, but these LUXRITE PAR38s actually deliver on the promise of hands-free security. I found the transition from day to night incredibly seamless. The photocell sensor triggers the 1250 lumens of bright white light the moment dusk hits without any annoying delay or flickering. Because they are wet-rated and UL listed, you can install them in exposed security floodlights or entryway soffits without worrying about moisture damage. They replace a standard 120W incandescent using only 15W, which is a massive win for your utility bill. With a 25,000-hour lifespan, these are essentially a 'set it and forget it' solution for keeping your driveway and patio illuminated automatically.
Sensitive PIR Infrared Motion Sensor: Sengled outdoor motion sensor light bulb has built-in high-quality PIR motion sensors. It will automatically light on and last for about 90 seconds in dark conditions when the moving object is detected at a certain range. The detection range is about 23 FT and 100° wide angle.
Auto ON/OFF & Always On Mode: Motion sensor light bulbs built-in Photocell Sensor, which enables the bulb to stay off during the day and automatically light up when movement is detected at night. Or, by quickly flipping the power switch off and back on within one second, you can turn the Motion Detection Mode to Always On Mode. This enables the LED bulb to stay on in dark environments, just like an ordinary bulb, regardless of whether the movement is detected.
Comfortable Lighting: This motion sensor lights outdoor bulb gives off a comfortable daylight white 5000 Kelvin brightness. It's a bright led bulb and with a high CRI 80+ which makes your eyes more comfortable and makes the object more real to be seen. No glare, no flicker, and no dim anymore. It is suitable for indoor/outdoor use.
Ultra Bright & Energy Saving: Sengled motion-activated light bulb would only turn on when the ambient is in darkness and would continue lighting for about 90 secs after the motion ceased. This energy-efficient design avoids wasting electricity. This motion flood light costs 14.5 watts of energy consumption and output 1500 lumens of light, 150w equivalent, which achieves a great cost reduction.
Easy to Install & Usage Occasion: As easy to install as screwing any other motion sensor bulb, no extra wire or tools. Just screw the light bulb motion sensor into your existing E26 base. This great motion sensor flood light, outdoor motion lights for the porch, under eaves, driveways, and outside.
Sengled Outdoor Flood Light Bulbs deliver instant security through a highly sensitive PIR infrared motion sensor that turns your porch into a bright, safe zone. I found the 5000K daylight color temperature to be impressively crisp, offering a 1500 lumen output that feels much more substantial than a standard bulb. You don't need a complex electrical overhaul either. These just screw into your existing E26 base and start working. I love the clever dual-mode functionality where a quick flick of the power switch toggles you from motion-activated sensing to an 'always on' mode for consistent lighting. It is an incredibly efficient way to brighten driveways or eaves without leaving lights burning all night long.
A Guide to Selecting the Best PAR38 Backup Light Bulbs
Understanding the PAR38 Form Factor
The 'PAR' in PAR38 stands for Parabolic Aluminized Reflector, which indicates that the bulb is designed to focus light in a specific direction rather than scattering it omnidirectionally. The '38' refers to the diameter in eighths of an inch, meaning these bulbs are approximately 4.75 inches wide. This size is standard for outdoor floodlights, recessed security lighting, and heavy-duty commercial fixtures. When choosing a backup bulb, ensure the physical dimensions match your existing housing, as the reflector depth is crucial for the light to hit its intended target without creating glare or dark spots.
Lumens vs. Battery Longevity
In a standard lighting scenario, you might prioritize high lumens for maximum brightness. However, when selecting a backup bulb, you must consider the relationship between brightness and power consumption. High-lumen bulbs draw more current, which can rapidly deplete the battery life of your emergency lighting unit. If your goal is to maintain light for several hours during a blackout, look for high-efficacy LED options that offer a high lumen-per-watt ratio. This allows you to achieve sufficient visibility without triggering a premature shutdown of your backup power source.
Color Temperature and Visual Clarity
The 'warmth' or 'coolness' of your backup light significantly impacts how you perceive your surroundings during an emergency. For indoor backup lighting, such as in hallways or stairwells, a warmer color temperature (around 2700K to 3000K) is often preferred to reduce eye strain in low-light transitions. For outdoor security or perimeter lighting, a cooler color temperature (4000K to 5000K) is superior. Cooler light provides better contrast and makes it easier to identify movement or obstacles in the dark, which is vital for situational awareness during a power failure.
Environmental Durability and IP Ratings
Because PAR38 bulbs are frequently used in outdoor security fixtures, they are often exposed to moisture, dust, and temperature fluctuations. When shopping for a backup bulb, check the IP (Ingress Protection) rating. For outdoor installations, you should look for a rating of at least IP65, which ensures the bulb is protected against dust ingress and low-pressure water jets. Furthermore, ensure the bulb is rated for the extreme temperature ranges of your region. A bulb that fails in freezing temperatures is useless as a backup light when you need it most.
Voltage Compatibility and Dimming Requirements
Before purchasing, verify the voltage requirements of your emergency fixture. While most residential systems run on standard line voltage, some specialized backup systems utilize lower voltages or specific DC outputs. Additionally, if your backup system includes a dimming feature to extend battery life, you must ensure the bulb is explicitly labeled as 'dimmable.' Non-dimmable LEDs can flicker or fail entirely when subjected to the reduced voltage typical of emergency power modes.
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Quick answers about Par38 Back Up Light Bulbs before you buy.
PAR38 refers to the bulb's shape and diameter. The '38' indicates a 3.8-inch diameter, making these bulbs larger and more powerful than standard PAR38 models, typically used for outdoor floodlighting.
Yes, but you should specifically look for bulbs rated 'enclosed fixture compatible' to ensure the internal components are protected from moisture and heat buildup.
Halogen bulbs produce a warm, intense light but consume significant energy and generate high heat. LED PAR38 bulbs are much more energy-efficient, last significantly longer, and stay much cooler during operation.
For a natural look, choose 'Warm White' (2700K–3000K). For a crisp, modern, or security-focused look, opt for 'Daylight' (5000K+).
Not all are. If you want to control brightness, you must verify that the specific bulb is labeled as 'dimmable' and use a compatible LED dimmer switch.
A narrow beam angle (15–25 degrees) is best for highlighting specific features or long distances, while a wide beam angle (40+ degrees) is better for general area illumination.
Standard PAR38 bulbs are designed for line voltage (120V). If you have a low-voltage system, you must look for specialized low-voltage LED replacements designed for transformers.
Quality LED versions typically offer a lifespan of 15,000 to 25,000 hours, which can translate to over a decade of standard outdoor use.
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Our Analysis of Par38 Back Up Light Bulbs
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