Satco General Lighting: The A15 Appliance Bulb Lineup

Satco’s general lighting line offers 7 core SKUs of 40W A15 appliance bulbs — S3720, S3810, S2840, S2744, S2741, S4160, and S4164. These aren’t glamorous bulbs. They’re the workhorses that keep refrigerators lit, ovens visible, and range hoods functional. At 300-420 lumens output, they deliver enough light to see what you’re doing without overwhelming small appliance interiors.

The entire lineup runs on 40W power rating and shares the same A15 standard appliance bulb shape. Where they differ is in the details that matter for specific applications — base types and coating options that determine which bulb fits which appliance.

Base Type Variations Drive the SKU Count

Medium screw (E26) or intermediate (E17/E12) base options explain why Satco maintains multiple SKUs for what looks like the same bulb. Your standard refrigerator takes an E26 medium base. Smaller appliances — think microwave ovens and some range hoods — need the E17 intermediate base. Get this wrong and you’re making another trip to the store.

The clear transparent finish dominates the line because appliance bulbs need to throw light efficiently in tight spaces. Frosted versions are available for diffused light when you don’t want harsh shadows inside display refrigerators or wine coolers.

Certain SKUs like S2840 include dimming capability. This matters for range hoods where you might want lower light levels during evening cooking. Most appliance applications don’t need dimming, but when you do, having the option built into a temperature-resistant bulb beats jury-rigging alternatives.

Built for Temperature Extremes

Appliance-specific design for high/low temperature environments separates these from standard household bulbs. Your average A19 bulb wasn’t designed to cycle between freezer temperatures and room temperature multiple times per day. It wasn’t built to handle oven heat either.

Vibration resistant construction matters when bulbs live next to compressor motors or exhaust fans. The filament support structure in appliance bulbs handles the constant shake that would kill a standard bulb in months.

At 2,500 hour rated life, these bulbs last about as long as you’d expect from incandescent technology in demanding conditions. That’s roughly a year of continuous use, or several years of typical appliance door openings. Not spectacular by LED standards, but predictable and reliable.

What Contractors Think

The professional reviews tell the real story. Lightbulb Wholesaler shows 4.9/5 rating from 50 reviews. eBay ratings sit at 4.8/5 from 45 reviews. These aren’t homeowners buying one bulb — these are maintenance crews and electrical contractors buying in bulk.

LightBulbs.com rates them 4.3/5 from 14 reviews, while Walmart shows 4.6/5 from 12 reviews. The consistency across platforms suggests these bulbs do exactly what they promise — provide reliable appliance lighting without surprises.

Specification	Value
Wattage	40W
Lumens	300-420
Color Temperature	2700K (Warm White)
CRI	100
Rated Life	2,500 hours
Voltage	130V (compatible with 120V systems)
Base Types	E26 (Medium) or E17/E12 (Intermediate)

The 130V rating compatible with 120V systems provides a durability buffer. Running a 130V-rated bulb on 120V power slightly reduces light output but significantly extends life — smart engineering for appliance applications where longevity matters more than maximum brightness.

Sold as single bulbs (carded) or bulk cases like 240-packs, depending on whether you’re a homeowner fixing one refrigerator or a property manager maintaining an apartment complex.

Frequently Asked Questions

Q: What’s the difference between all these SKU numbers? A: Base type and finish mainly. S3720, S3810, S2840, S2744, S2741, S4160, and S4164 give you combinations of E26 medium base, E17 intermediate base, clear glass, frosted glass, and dimming capability. Check your appliance socket before ordering.

Q: Will these work in my oven? A: Ovens are listed as a standard application. The bulbs handle high-temperature environments. Just verify you need an A15 shape and check whether you need E26 or E17 base.

Q: Why do some have dimming and others don’t? A: Dimmable options like S2840 cost slightly more to manufacture. Most appliance applications don’t need dimming, so Satco offers both to keep costs down on the standard versions.

Q: How do these compare to LED replacements? A: LED A15 replacements exist in 8W to 75W equivalents. They’ll last longer and use less power. But they also cost more upfront and some older appliances have issues with LED compatibility. These incandescents just work.

Q: What’s the actual light output difference between 300 and 420 lumens? A: About 40% brighter at the high end. The variation comes from manufacturing tolerances and which specific SKU you’re looking at. All provide adequate appliance lighting.