Short answer: Type A LED tubes plug into your existing fluorescent ballast, Type B tubes bypass the ballast and run directly on line voltage, and Type A+B (hybrid) tubes can do either. If you want the fastest swap and your ballasts are healthy electronic T8 ballasts, A+B gives you a plug-and-play start with a bypass option later. If you are rewiring anyway, or your ballasts are magnetic or failing, go straight to Type B and remove the ballast for good.
Below is how each type works, what it costs you in labor and long-term maintenance, and how to pick the right one for a 4ft or 8ft fluorescent retrofit.
The Three Main LED Tube Types at a Glance
| Type A (Plug-and-Play) | Type B (Ballast Bypass) | Type A+B (Hybrid) | |
|---|---|---|---|
| Uses existing ballast? | Yes, required | No, ballast removed | Either |
| Rewiring needed? | No | Yes, one time | Not at first; optional later |
| Install time | Fastest | Slowest (wiring per fixture) | Fast now, rewire when ballast fails |
| Ballast compatibility risk | Yes, must match ballast list | None | Only while on ballast |
| Future ballast replacements | Yes | No | No, once bypassed |
| Energy use | Tube + ballast losses | Tube only | Depends on how it is wired |
Type A: Plug-and-Play LED Tubes
A Type A tube has an internal driver designed to run off a fluorescent ballast. You pull the old lamp and snap in the LED tube. No wiring, no electrician on every fixture.
Pros
- Quickest installation, good for occupied spaces where you cannot open fixtures.
- No changes to fixture wiring.
Cons
- Ballast compatibility. Not every tube works with every ballast. Always check the tube against the ballast make and type in your fixtures. Most plug-and-play tubes are built for electronic T8 ballasts, not older magnetic ballasts.
- The ballast is still a failure point. When the ballast dies, the light goes out even though the LED tube is fine. You end up buying ballasts again.
- Extra power draw. The ballast consumes some energy on top of the tube's rated wattage.
Type B: Ballast Bypass (Direct Wire) LED Tubes
A Type B tube has its driver built in and runs directly on line voltage. The installer removes or disconnects the ballast and wires line power to the sockets. After that, there is no ballast left to fail.
Single-ended vs. double-ended power
Type B tubes come in two wiring styles, and you need to know which one you have before you start:
- Single-ended: line and neutral both go to one end of the tube. These typically require non-shunted sockets on the powered end.
- Double-ended: line goes to one end and neutral to the other. This layout is common on 8ft single pin tubes and can usually use the fixture's existing sockets.
Follow the tube's installation guide exactly and have a qualified electrician do the work. Wiring a single-ended tube into a fixture set up for double-ended (or the reverse) is the most common Type B installation mistake.
Pros
- No ballast to buy, replace or troubleshoot again.
- No ballast compatibility list to check.
- Power draw is the tube's rated wattage only.
Cons
- Higher up-front labor because each fixture is rewired.
- The fixture should be labeled as converted so the next person does not install a fluorescent lamp in it.
Type A+B: Hybrid Tubes That Work Either Way
A hybrid tube runs on a compatible ballast today and can be rewired for direct line voltage later. That is useful when you have a mix of fixtures, a tight install window, or a budget that covers tubes now but not full rewiring.
A common approach: install the tubes on the existing electronic ballasts, then bypass each fixture as its ballast fails. You never buy another ballast, and you spread the labor over time instead of doing it all at once.
Our T8 4FT LED Tube Light (Ballast Compatible & Bypass Ballast) works this way. According to the product page, it is designed to work with most T8 electronic ballasts (not magnetic ballasts) and can also be wired directly to 100-277V. Key specs:
- Selectable wattage: 8W, 10W, 12W, 15W, 18W or 20W
- Up to 2,700 lumens; 135 lumens per watt without a ballast
- Selectable color temperature: 3000K, 3500K, 4000K, 5000K, 6000K or 6500K
- Single- and double-ended power options
- Frosted or clear lens, 120° beam angle, 50,000-hour rated life
- Price: $7.00 frosted, $6.90 clear
Selectable wattage and color temperature mean one SKU can cover offices, hallways, storage rooms and back-of-house areas, which simplifies ordering and spare stock.
What About 8ft Fluorescent Fixtures?
Eight-foot fluorescent fixtures often use F96T8 or F96T12 single pin lamps with FA8 sockets. Plug-and-play options for these are limited, and many of these fixtures still have old magnetic ballasts, so ballast bypass is usually the practical route.
Our 8FT T8 LED Tube, Single Pin FA8, 45W is a Type B, double-ended bypass tube:
- 45W, 5,400 lumens (120 lumens per watt)
- 5000K with frosted lens ($15.00) or 6500K with clear lens ($18.00)
- 100-277V input, 120° beam angle, 50,000-hour rated life
- Sold in boxes of 25 units
Confirm your sockets are single pin FA8 before ordering. Fixtures with recessed double contact (R17d) sockets, typical of high-output lamps, need a different tube.
When to Skip Tubes and Replace the Fixture
If the fixtures themselves are rusted, the lenses are yellowed, or the sockets are brittle and cracking, retrofitting tubes into them is not a good use of labor. A new LED fixture can cost about the same as rewiring an old one. Options to consider:
- 4FT LED Integrated Tube Shop Light (18W-30W and 3000K-6500K selectable, from $15.00) for garages, storage and utility rooms.
- 4 ft. LED Strip Light (20W/30W/40W selectable, 120-277V, $41.00) for surface-mounted replacements of old strip fixtures.
- Our full range of linear LED fixtures and LED panel lights for drop-ceiling troffers.
How to Choose: A Quick Checklist
- Check the ballast. Open one fixture per area and read the ballast label. Electronic T8 with good life left? A+B is a good fit. Magnetic, T12, or failing? Go Type B.
- Check the sockets. Shunted or non-shunted for 4ft bi-pin; FA8 single pin or R17d for 8ft.
- Weigh labor now vs. later. Plug-and-play saves labor today; bypass saves ballast replacements later. A+B lets you split the difference.
- Standardize. Use one tube type per building where possible, and label converted fixtures, so maintenance staff always know what is installed.
- Match color temperature. 3500K-4000K is common for offices and schools; 5000K-6500K for warehouses, garages and workshops.
For more background, see Everything You Need To Know About LED Tube Lights.
FAQ
Can I put a Type B tube in a fixture that still has a ballast connected?
No. A Type B tube is designed for line voltage only. Disconnect or remove the ballast and wire the sockets per the tube's installation instructions before installing it.
Will a plug-and-play tube work with my magnetic ballast?
Usually not. Most plug-and-play and hybrid T8 tubes, including our 4ft A+B tube, are made for electronic ballasts. With magnetic or T12 ballasts, plan on a ballast bypass installation.
Is Type A+B worth it if I am bypassing everything anyway?
It still works fine as a bypass tube, and keeping one hybrid SKU on the shelf covers both situations. If every fixture is being rewired on day one, either a hybrid or a dedicated Type B tube will do the job.
Do LED tubes work in shunted sockets?
Type A tubes and double-ended Type B wiring generally work with existing sockets. Single-ended Type B wiring typically needs non-shunted sockets on the powered end. Check the tube's wiring diagram before you buy sockets.
Get the Right Tubes for Your Retrofit
Browse our commercial LED tube lights for 4ft and 8ft replacements, with free shipping on orders over $149. Not sure which type fits your fixtures, or need pricing on a large quantity? Call us at (678) 231-4970 and we will help you sort it out.
