Converting fluorescent lighting to LED is one of the highest-ROI lighting upgrades available for commercial, industrial, and institutional facilities. LED tubes deliver 30–50% energy savings over fluorescent, last up to 3–4x longer, and eliminate the mercury disposal requirements associated with fluorescent lamps. This guide covers everything you need to know — from tube type selection and ballast compatibility to wiring procedures and retrofit kit options.
Why Convert Fluorescent Lighting to LED?
- Energy Efficiency: LED tubes convert the majority of consumed electricity into light. Typical savings range from 30–50% versus T8 fluorescent and up to 60% versus older T12 systems.
- Longevity: LED tubes are rated for 50,000+ hours — approximately 3–4x longer than standard T8 fluorescent lamps (15,000–20,000 hours), significantly reducing maintenance labor costs.
- No Mercury: Fluorescent lamps contain mercury and require special hazardous waste disposal. LED tubes contain no mercury, simplifying end-of-life disposal and eliminating regulatory compliance costs.
- Better Light Quality: Modern LED tubes offer superior CRI, selectable CCT, and more consistent lumen output over their lifespan. Fluorescent lamps degrade significantly as they age.
- DLC Rebate Eligibility: Many LED tubes are DLC-listed, qualifying for utility rebate programs that can offset 20–50% of upfront product costs. Browse our DLC-Listed Commercial LED Products for rebate-eligible options.
Understanding Fluorescent Tube Sizes
- T8 (1-inch diameter, 48-inch length): The most widely installed fluorescent tube in commercial buildings. The primary target for LED retrofit projects.
- T12 (1.5-inch diameter, 48-inch length): An older, less efficient format. T12 ballasts are no longer manufactured and must be bypassed or the fixture replaced entirely.
- T5 (5/8-inch diameter, ~46-inch length): A compact high-output format used in display cases and architectural applications. T5 fixtures are NOT cross-compatible with T8 or T12 lamps due to different pin sizes and physical lengths.
The Three LED Tube Types: A, B, and C
UL Type A — Ballast Compatible (Plug-and-Play)
Works directly with the existing fluorescent ballast. No rewiring required — simply swap the tube.
- Pros: Fastest installation, lowest labor cost.
- Cons: Performance depends on ballast compatibility. When the ballast fails, it must be replaced or the fixture rewired.
- Best for: Large-scale retrofits where minimizing labor cost is the priority and ballasts are relatively new.
UL Type B — Ballast Bypass (Direct Wire)
Bypasses the fluorescent ballast entirely and connects directly to line voltage (120V or 277V).
- Pros: Eliminates ballast dependency. More energy-efficient (no ballast energy loss). Best long-term ROI.
- Cons: Requires rewiring by a qualified electrician. Single-ended vs. double-ended wiring must be verified before purchasing.
- Best for: Long-term installations or when existing ballasts are at end of life.
UL Type C — Remote Driver
Requires a separate external LED driver installed in the fixture housing, replacing the fluorescent ballast.
- Pros: Highest efficiency, best dimming performance, supports 0-10V dimming. Driver replaceable independently of tube.
- Cons: Highest installation complexity and upfront cost.
- Best for: High-performance commercial applications requiring dimming or strict energy code compliance.
Browse our LED Tube Lights and LED Retrofit Lamps for Type A, B, and C options.
Shunted vs. Non-Shunted Tombstones
Tombstones are the lamp holders at each end of the fixture. Getting this wrong is one of the most common retrofit mistakes:
- Shunted tombstones: Both contacts are electrically connected. Required for rapid-start ballasts and double-ended Type B LED tubes.
- Non-shunted tombstones: Contacts are electrically isolated. Required for single-ended Type B and Type C LED tubes. Using a shunted tombstone with a single-ended Type B tube will cause a short circuit.
Always verify tombstone type before purchasing. Replace tombstones with power fully disconnected at the breaker.
Step-by-Step Conversion Process
- Safety First: Switch off the circuit at the breaker and verify power is off with a non-contact voltage tester.
- Identify Your Setup: Note the tube size (T8, T12, T5), ballast brand and model, and tombstone type (shunted or non-shunted).
- Select Your LED Tube Type: Choose Type A, B, or C based on your compatibility assessment and project goals.
- For Type B — Remove the Ballast: Disconnect ballast wiring, remove the ballast from the fixture housing, and replace tombstones if required.
- Wire the Fixture: For single-ended Type B, connect line voltage to one end only. For double-ended, connect live to one end and neutral to the other. Follow the tube's wiring diagram.
- Install the LED Tubes: Insert pins into tombstones, rotate to lock, and verify the tube is seated securely.
- Restore Power and Test: Switch the breaker on and verify all tubes illuminate. Flickering may indicate a wiring or compatibility issue.
Retrofit Costs and ROI
- Type A retrofits have the lowest upfront cost but carry ongoing ballast replacement risk.
- Type B retrofits have moderate upfront cost and the best long-term ROI due to eliminated ballast costs and higher efficiency.
- Utility rebates for DLC-listed LED tubes can offset 20–50% of product costs — always check your utility's rebate program before purchasing.
- Payback periods for commercial retrofits typically range from 1–3 years depending on operating hours and local electricity rates.
Shop LED Retrofit Products at Bees Lighting
We carry a professional selection of Type A, B, and C LED tubes, retrofit kits, and DLC-listed commercial LED products for T8, T12, and T5 fixture conversions.
Need help selecting the right LED tube type or verifying ballast compatibility? Call our technical team at 855-303-0665 for free project support.
