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The LED Authority

40 Watt, 48 Inch T12 Black Lite Blue Fluorescent Bulb (Pack of 6)

SKU: F40BLB-14 | Ordering Code: F40T12/BLB

$95.94  ($15.99 per Bulb)
Pack of 6
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Product Highlights

  • Estimated life of 18.3 years based on 3 hours use per day

CXL brand 40W, Black Light Blue T-12 Fluorescent Lamp

  • Provides special lighting effects for a variety of industries
  • BLB dark color filters out visible light while still highlighting the lighter colors
Full Specs



Model Number


Energy Used

A rating, expressed in watts, to indicate the rate at which a lamp consumes energy. Also known as wattage value.
Energy Used
40 Watts


The end (or ends) of the lamp that fits into the socket.
Medium Bipin

Bulb Shape

The description of the general appearance of a lamp/bulb consists of a letter(s) followed by a number. The letter indicates the shape of the bulb and the number relates to the diameter of the bulb in eighths of an inch. For example, a common household bulb is the A-19. The bulb is "A" shape and the diameter would be nineteen 8ths of an inch, or 2 3/8".
Bulb Shape

Bulb Color

The color of the light produced by a bulb
Bulb Color

Bulb Finish

The surface finish of a bulb, which may affect the quality of the light emitted.
Bulb Finish

Bulb Technology

The technology implemented by the bulb, e.g. incandescent, halogen, LED
Bulb Technology

Average Rated Life (hr)

A measurement of the average length of time, between first use and the point when 50% of the lamps tested have stopped functioning, , using an operating cycle of 3 hours on, 20 minutes off.
Average Rated Life (hr)

Length (in)

Also referred to as "Maximum Overall Length" (MOL). For light bulbs, it measures the length of a light bulb, from the top of the bulb to the bottom of the base or pins and is typically expressed in inches. For light fixtures and ballasts, it applies to the total horizontal length of the item.
Length (in)

Diameter (in)

Light bulbs: a measurement of a bulb's width taken at the widest point of the bulb. Fixtures: the measurement across the widest point of a circular fixture.
Diameter (in)

Contains Mercury (Hg)

Contains some level of the element Mercury. Typically, bulbs containing Mercury display the symbol 'Hg'.
Contains Mercury (Hg)


A General Electric brand-specific product number for an equivalent item and is provided for the purpose of cross-referencing.
10531 - F40BLB

Osram Sylvania

An Osram Sylvania brand-specific product number for an equivalent item and is provided for the purpose of cross-referencing.
Osram Sylvania
24026 - F40/BLB/RP
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Q & A
Do you know the wavelength of the UV? 365 nanometer maybe?


Depending on the ballast used, the environment and many other factors these can range from 350 to 750 nm. This particular product typically runs 350-370 nm. Please contact Customer Service at 888-455-2800 for further assistance.


will this bulb interchange with white bulbs in existing light fixture.


Yes, this bulb can be used in an existing 4 foot T12 fixture.