Pull the old T8 out of your fixture and the question narrows to three things: which base, which length, and whether the ballast stays or goes. You will find G13 bi-pin, Fa8 single pin, R17d twist, E39 mogul, and E26 screw here, from a 2FT stub up to a 115W corn bulb.
The one-star photo lands first: a 4FT tube that lit for a day, or two dead out of six in the box. That risk you are already pricing in is why this spec sheet opens with certification and warranty rather than brightness adjectives. Across the tube and shop-light range, buyers have left 249 verified reviews at a 4.4-star average, and the 4FT shop-light six-pack you will see most often sits at 4.6 stars over 144 of them. Read what that average hides: ratings run from 3.6 to 4.6 depending on which fixture you pick, and each product card on the home page prints its own rating rather than the average.
Your fixture decides the rest. Measure your pin-to-pin length, check whether your old tube ends in a G13 bi-pin, an Fa8 single pin, or an R17d twist, and a tube that matches yours exists from a 2FT 20W stub up to a 115W corn bulb.
One garage owner running six 4FT fixtures six nights a week swapped 55W fluorescents for the 24W tubes: the same 2,640-lumen bench light, roughly a third of the panel draw, and no ten-second warm-up on a 40F morning. WAHADI LED LLC is the manufacturer of record on those tubes, the freezer fixtures, and the emergency bulbs.
WAHADI LED LLC ships under a single manufacturer of record, and the range walks from a 2FT 20W stub through a 5FT 48W dual-row tube to a 115W E39 corn bulb for a lot pole. That spread exists because a fluorescent fixture almost never comes out of a building whole. The housing stays on the ceiling, the ballast goes in the bin, and the replacement has to fit the sockets already screwed to the joists.
Read the certification line before the brightness line. ETL sits on most of the tubes and shop lights, UL sits on the E39 corn bulb, and neither mark went on until an independent lab put the driver through shock and fire testing. DLC is absent, which matters if a utility rebate program is part of your budget: that paperwork will not accept these, and finding out at the rebate desk costs more than reading it here.
The 4FT 24W linkable shop light carries 144 of the 249 verified reviews on its own, and its 4.6 average is the highest volume in the range. The 5FT bi-pin tube sits at 3.6 across 24 reviews, and the pattern behind that gap is a dead unit found on the ceiling rather than on the bench. Bench-test every tube inside the retailer 30-day window and a dud becomes a return instead of a warranty claim in month seven.
WAHADI prints an ETL or UL mark on the end cap, a 2-year limited warranty line per product, and three named gaps (no DLC, no dimming, no NSF rating) straight into the buyer guidance on the home page.
Turn a tube end-cap toward the light and the ETL mark reads straight off the aluminum print. An inspector walking your bay confirms it in seconds, because an independent lab shock-tested and fire-tested that driver before the mark was allowed on.
Set a 24W tube beside the 55W fluorescent it replaces: the draw falls 56 percent, not the 90 a headline would prefer. Both ends of the 60-to-80 percent range come off wattage math you can redo on your own fixture label in under a minute.
Read the warranty line on each product page before the case ships: most tubes print an explicit 2-year limited term. A few print none, and that difference stays visible per product instead of averaging into one blanket claim you discover at month fourteen.
Read the three disqualifications before you add anything to a cart: no DLC listing, no dimmer support, no NSF rating. That disclosure sits ahead of the buy button, where it can still change your order, not in a warranty PDF you open in month three.