It’s doable with a few basics in place. Here’s a simple approach:

• Match voltage: Confirm the light is designed for 12V DC systems.
• Size the circuit: Add up wattage and estimate current (amps = watts ÷ 12). Choose wire and an in-line fuse rated just above your load.
• Use safe connections: Maintain correct polarity, include a switch, and secure all connections to avoid shorts or chafing.
• Protect the battery: Avoid deep-discharging a starting battery. For longer runtimes, a deep-cycle battery may be more suitable.
• Mount smart: Keep lights away from heat, moving parts, or water unless they’re rated for it.

This setup can work well for vehicles, boats, or portable use, but actual performance varies with battery condition, wiring length, and the light’s draw. If unsure, a qualified installer can help.

Look for a regulated 12V DC power supply that fits your application and load. A quick checklist can help:

• Match voltage: The output should be 12V DC for most 12V LED strips, bars, and dome lights.
• Size the amperage: Total your lights’ wattage and divide by 12 to estimate amps, then add 20–30% headroom.
• Choose the style: Plug-in adapters work for small indoor setups; hardwired supplies are common for larger or permanent installs.
• Environment: Use indoor supplies inside; choose weather‑resistant units for damp or outdoor areas.
• Controls: If you plan to dim or use RGB controllers, confirm the supply and controller are compatible.

Checking the product page specs and reviews on Walmart.com can help you align the power supply with your specific lights.

The terms can be confusing, but here’s the gist:

• At home (AC mains): 12V LED products typically need an AC‑to‑DC power supply. It’s often called a transformer, adapter, or LED driver. For 12V LED strips, a constant‑voltage 12V DC driver is generally used.
• In vehicles/boats/RVs: You already have a 12V DC system, so you typically connect through a fuse and switch (or a controller) rather than a separate transformer.
• Built‑in electronics: Some lights include regulation components. Always review the product specs to see what’s required.
• Avoid mismatches: Don’t power DC‑only LEDs with 12V AC, and confirm polarity and current capacity.

Choosing the right power accessory can improve performance and longevity, but needs vary by product and installation.

You can estimate runtime with a quick calculation:

1. Find battery capacity: Amp‑hours (Ah) × 12 ≈ watt‑hours (Wh).
2. Estimate usable energy: Use a conservative fraction (about 50–80%) to protect battery health.
3. Add your load: Total your lights’ wattage.
4. Estimate runtime: Approximate runtime (hours) ≈ usable Wh ÷ total watts.

Example: A 12V 10Ah battery ≈ 120Wh. Using ~60–80% (72–96Wh) for a 24W setup could yield around 3–4 hours, depending on conditions.

Actual performance varies with battery age, temperature, wiring losses, and brightness settings. To avoid a no‑start situation, be cautious using a vehicle’s starting battery; a deep‑cycle battery is often better for lighting loads.

Start with where and how you’ll use them, then narrow down:

• Purpose: Accent lighting favors lower output or color‑changing strips; task or driving lights may need higher output and specific beam patterns (spot, flood, or combo).
• Color temperature: Warm white (around 3000–3400K) tends to feel cozy; neutral (about 4000K) balances clarity and comfort; cool/Daylight (around 6000–6500K) appears crisp and bright.
• Location: For exterior or marine use, look for water‑resistant ratings and corrosion‑resistant materials.
• Fit and features: Consider length, trimmable sections, adhesive backing, and whether you want app control, music sync, or a simple switch.

Product pages on Walmart.com list lumen output, color options, and ratings, which can help you compare choices for your space.