Lighting & Electrical Buying Guide

How to Choose the Right Lighting and Electrical Supplies

Quick answer: Buy LED bulbs by lumens and color temperature, not watt-equivalent alone, size electrical boxes by fill capacity (how many conductors go in, not just physical fit), use GFCI outlets anywhere near water or outdoors, and match conduit and connector type to the wire gauge and environment they're protecting.

Lighting and electrical supplies get bought by rough habit more than by spec — the same bulb, the same outlet, the same box, regardless of the actual space or code requirement. Here's how to spec each category correctly instead of defaulting to what's familiar.

LED bulbs: lumens and color temperature, not watts

Watts measure power draw, not brightness — with LED, a low-watt bulb can produce as much light as a much higher-watt incandescent, so comparing bulbs by watts alone is comparing the wrong number. Use lumens to compare actual brightness, and color temperature (measured in Kelvin) to match the light quality to the space: 2700–3000K reads warm and residential, 3500–4100K is a neutral general-purpose white, and 5000K+ reads cool and closer to daylight, better suited to work areas and detail-oriented tasks. Our LED bulbs line is organized by both, so match to the space before matching to the old bulb you're replacing.

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Electrical boxes: fill capacity matters more than physical size

An electrical box has to be sized by fill capacity — the volume required for the number of conductors, devices, and clamps going into it — not just whether the box physically fits the opening. Overfilling a box is a real safety and code issue, not just a tight fit; it restricts heat dissipation and makes safe wiring connections harder. Our electrical boxes line includes both indoor and weatherproof outdoor-rated options — check cubic-inch capacity against your actual conductor count before assuming a box that looks big enough actually is.

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Outlets: match the type to the location, not just the plug

Standard outlets aren't rated for use near water — any outlet within reach of a sink, outdoors, or in a garage or unfinished basement needs GFCI protection, which trips the circuit fast enough to prevent shock in wet conditions that a standard outlet simply can't detect. This isn't optional in most of those locations under electrical code, and skipping it is one of the more common (and more dangerous) shortcuts we see in DIY and quick-repair electrical work.

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Conduit and connectors: match to wire gauge and environment

Conduit size has to accommodate the wire gauge and number of conductors running through it without overfilling, the same fill-capacity logic that applies to electrical boxes. The connector and conduit type also needs to match the environment — indoor dry-location conduit isn't rated for the same exposure as outdoor or wet-location runs. Check both the fill rating and the environmental rating in our conduit and connectors line before assuming any conduit works anywhere.

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Wall plates and batteries: small parts, still worth matching correctly

Wall plates need to match both the device count (gang size) and the outlet or switch type underneath — a standard plate won't fit cleanly over a GFCI or a decora-style switch. Our wall plates line covers both. For portable lighting, alarms, and battery-powered devices around the same electrical projects, our household batteries line covers the common sizes — worth stocking alongside the wiring supplies rather than a separate trip.

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Quick buying checklist

  • Compare LED bulbs by lumens and color temperature (Kelvin), not watt-equivalent alone
  • Size electrical boxes by fill capacity for your actual conductor count, not just physical fit
  • Use GFCI outlets near water, outdoors, in garages, and in unfinished basements
  • Match conduit fill rating and environmental rating (indoor vs. wet-location) to the run
  • Match wall plates to both gang size and the device type underneath (standard, GFCI, decora)
  • Stock common household battery sizes alongside electrical projects, not as a separate trip

Go deeper

A closer look at sizing conduit and picking the right connector.