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The LED Authority

Philips 20 Watt, 48" T8 Cool White LED Bulb - Retrofits T12 Fluorescent Fixtures, Rapid Start Magnetic Ballast Compatible

SKU: 463117 | Ordering Code: 20T12EMLED/48-4000 IF G  | UPC: 046677463113

$11.99 per Bulb
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Product Highlights

  • Estimated life of 32.9 years based on 3 hours use per day
  • No lead or mercury means easy and environmentally safe disposal

Lighting Facts Per Bulb

Brightness 2100 lumens
Estimated Yearly Energy Cost $2.41
Based on 3 hrs/day, 11¢/kWh
Cost depends on rates and use
Based on 3 hrs/day32.9 years
Light Appearance
4000 K
Energy Used20 watts
  • Clearance

Philips InstantFit T8 LED electro-magnetic compatible lamps are an ideal way to easily to upgrade T12 fluorescent fixturesto energy-saving LED. The 20 watt non-dimmable glass bulbs are compatible with a wide range of rapid-start magnetic ballasts designed for T12 fluorescent lamps. They eliminate the need to have an electrician rewire the fixture. Simply take out the existing fluorescent T12 lamp from a fixture that has a electro-magnetic ballast and replace with the Philips LED T8 InstantFit lamp. They are an ideal energy saving choice for existing linear fluorescent fixtures. Suitable for use in fixtures where ambient temperature is between -4°F and 113°F. Can be used in lensed recessed troffers.

  • Compatible with many rapid-start magnetic ballasts designed for T12 fluorescent lamps, including Philips Advance and Universal. Power to the lamp must be turned off before replacing the lamp. Call one of our Lighting Specialists for details at 888.455.2800.
  • Non-Dimmable.  Do not use with dimming ballasts
  • Direct replacement for F40T12 and F34T12 fluorescent lamps
  • 50% energy savings vs. F40T12 rapid-start magnetic systems
  • NSF certified - Can be used in food areas and refrigerated food displays
  • Eliminate the need for rewiring and allows the fixture to maintain original UL and CSA compliance
  • Light distribution that uniformly illuminates the work surface
  • Perfect for applications with frequent "on/off" switching cycles, and buildings that desire to be mercury free
  • Instant on, no flicker or buzz
  • Fits into existing linear fixtures
  • Emits virtually no UV rays or IR
  • Glass construction in a T8 form factor which can upgrade the look of your fixture
  • Fits into the existing T12 sockets that are non-shunted G13 (meduim bi-pin) lamp holders
  • Suitable for damp locations
  • 2100 lumens is based on a normal ballast factor


Full Specs


Philips Lighting

Product Line


Model Number

20T12EMLED/48-4000 IF G

Energy Used

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


A measure of "electrical pressure" between two points. The voltage specification of an incandescent lamp is the electrical "pressure" required to drive it at its designed point. The "voltage" of a ballast (e.g. 120 V) refers to the line voltage coming from the power source and is connected to the ballast.


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
Cool White


Color Rendering Index is an international system used to rate a lamp's ability to render object colors. The higher the CRI (based upon a 0-100 scale) the richer and more accurately colors generally appear. CRI differences among lamps are not usually visible to the eye unless the difference is more than 3-5 points.

Color Temperature (Kelvin)

An expression of the hue of the light emitted, measured in degrees Kelvin. Usually expressed by a four digit number followed by (k), such as 2700k. Higher temperatures indicate whiter, "cooler" colors, while lower temperatures indicate yellower, "warmer" colors. Some common Kelvin temperature benchmarks are 2700k (warm white), 3500k (neutral white), 4100k (cool white), 5000k (bright white), and 6500k (daylight).
Color Temperature (Kelvin)

Brightness (Lumens)

A rating of the initial light output of a bulb, rated after 100 hrs of operation. Lumens are a measure of how much light falls on one square foot of area, one foot away from the light source.
Brightness (Lumens)

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)

Operating Temperature (°F)

The ambient temperature in which the product can safely operate.
Operating Temperature (°F)
-4 to 113

Beam Angle (°)

The width of a light beam, expressed in degrees. The beam angle is often part of the ordering code for reflector lamps. For example, a 50PAR30/HIR/NFL25 is a 50-watt PAR30 narrow flood lamp with a beam angle of 25 degrees.
Beam Angle (°)

Bulb Power Type

Defines how a lamp is powered, whether it needs a ballast or not, or can use either
Bulb Power Type
Ballast Compatible

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)

Socket Type

Type of socket a linear lamp is compatible with, whether shunted, non-shunted or both.
Socket Type
Non Shunted


3 year limited
Customer Reviews

This bulb works great with my existing 48" T12 Office Fixtur


These bulbs are bright. Maybe 30% brighter than my old mercury bulbs. My fixtures allow the installation of four bulbs. I currently have two of these LED bulbs installed with legacy functional mercury bulbs. The light produced by the combo is bright and warm. Really love the bulbs and highly recommend. I only installed them two weeks ago so I can't make a judgement on the longevity of the bulbs yet.




Something is not right about your advertisement.


I ordered two of ten of your SKU: 463117 T-8 Retrofits T-12s and I am glad that was it because they do not work as advertised at all. My ballast is a Advance R-2S40-1-TP magnetic rapid start ballast. I have ordered close to 100 hundred bulbs from you gays and have not had any problems, this is not acceptable.


Las Vegas 89131


Forget It


These did not work in fixtures with a magnetic ballast. We were hoping to re-lamp our entire shop with 48" LED's but all of our fixtures have magnetic ballasts. The cost of replacing the fixtures would negate the savings from using LED's.

Player Piano Man

Northbrook, IL


Philips 20 Watt, 48" T8 Cool White LED Bulb - Retrofits T12 Fluorescent Fixtures, Rapid Start Magnetic Ballast Compatible

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Q & A