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Six 18 inch T8 fluorescent tubes in a pack

SYLVANIA

SYLVANIA 21623 F15T8/350BL 15W 18in T8 Black Light Bulb 6 Pack

SKU CH-4AGY-NE9AS

Six-pack of 15 W, 18-inch T8 fluorescent tubes with medium bi-pin bases for black-light applications

  • Power rating15
  • Product typeFluorescent Tubes
  • Emits UV-A black light for fluorescent effects
  • 15 watt fluorescent tube provides consistent output
  • 18 inch T8 length fits standard fixtures
  • Medium bi-pin base ensures secure installation
  • Case of six tubes supplies multiple locations

Six-pack fluorescent black-light tubes

The SYLVANIA 21623 F15T8/350BL pack contains six 15 watt fluorescent tubes that emit black-light output. Each tube measures 18 inches and uses a T8 form factor with medium bi-pin bases. The set is intended for fixtures that accept standard T8 lamps.

Low heat and quiet operation

Fluorescent technology runs cooler than incandescent alternatives at the same 15 watt rating. The tubes produce minimal audible noise during normal use. Power draw remains steady at the rated wattage when paired with a compatible ballast.

Medium bi-pin mounting for standard fixtures

The medium bi-pin bases slot directly into common T8 sockets without adapters. An 18 inch length fits many commercial and residential troffers, strips and shop-light housings. Buyers needing shorter or longer tubes, or a different pin spacing, should verify fixture compatibility before purchase.

How it compares

Measured against everything we stock in Lighting Fixtures & Bulbs, at today’s prices. Recalculated every night.

Price $31.99
Pricier than about 55% of the 491 comparable items (median $28.99).

Specifications

Product
Brand nameSYLVANIA
Product typeFluorescent Tubes
Power
Power rating15

Questions about this item

How do I install the 15W T8 fluorescent tube and what step is often missed?

Turn off power, align the medium bi-pin ends with the sockets, insert and twist until seated; the step often missed is confirming the ballast is rated for 15 watt F15T8 operation.

What maintenance or replacement will the F15T8/350BL tubes need over time?

Fluorescent black-light output declines with use; plan to replace all six tubes when the 350BL phosphor noticeably dims or the ends darken.

What limit appears first during continuous operation of the 18 inch black-light tubes?

Phosphor degradation reduces UV output before the tube fails completely; expect gradual dimming during sustained use.

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