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- Estimated life of 45.7 years based on 3 hours use per day
- No lead or mercury means easy and environmentally safe disposal
Product Description–
Lighting Facts Per Bulb |
| Brightness 2600 lumens |
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Estimated Yearly Energy Cost $2.53
Based on 3 hrs/day, 11¢/kWh
Cost depends on rates and use
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Life
Based on 3 hrs/day45.7 years
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Light Appearance
WarmCool
6500 K
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| Energy Used21 watts |
Keystone's 21 watt non-dimmable 48" 6500K double-sided ballast bypass T8 LED sign tube has LED modules on two sides and are designed for lighting marquees, box signs, backlit displays, roadway signs and many other types of outdoor and indoor displays. They are designed to replace T12HO and T8HO fluorescent lamps. Unlike standard LED lamps with 120° to 180° beam angles, the Keystone double-sided T8 lamp offers a virtual 360° distribution with individual optics that create bright and uniform illumination without any dark spots. The lamp comes in a 6500K color temperature to provide the best color quality and visual impact.
The ballast must be bypassed when present.
- Fits a minimum length of 45.72" and a maximum of 45.91"
- Ideal for both single sided and double sided signs
- Installs using existing sockets in the sign
- Optical lens over individual LEDs for optimal light spread within the sign
- Listed on SAM manual for the state of CA
- Effective 360° beam spread
- Rotatable end caps
- Double sided design provides even lighting in signs with no hot-spotting
- UL Classified: LED sign retrofit, evaluated to UL 48 / UL 879A Standards
- No external driver or power supply needed
- Durable polycarbonate construction
- 2600 total lumens; 1300 per side
Full Specs–
Brand | Keystone |
Model Number | KT-LED21T8-48P2S-865-D |
Energy Used
A rating, expressed in watts, to indicate the rate at which a lamp consumes energy. Also known as wattage value.
| 21 Watts |
Fluorescent Equivalent
The total wattage of fluorescent lamps in a fixture that this fixture replaces.
| 60 |
Volts
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.
| 120-277 |
Base
The end (or ends) of the lamp that fits into the socket.
| R17d |
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".
| T-8 |
Bulb Color
The color of the light produced by a bulb
| Daylight White |
CRI
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.
| 80 |
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).
| 6500 |
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.
| 2600 |
Bulb Finish
The surface finish of a bulb, which may affect the quality of the light emitted.
| Clear |
Bulb Technology
The technology implemented by the bulb, e.g. incandescent, halogen, LED
| LED |
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.
| 50000 |
Operating Temperature (°F)
The ambient temperature in which the product can safely operate.
| -4 to 131 |
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.
| 360 |
Bulb Power Type
Defines how a lamp is powered, whether it needs a ballast or not, or can use either
| Ballast Bypass |
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.
| 45.8 |
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.
| 1.1 |
Nominal Length (ft)
The length to the nearest foot that linear bulbs or fixtures will fit.
| 4 |
Manufacturer Warranty | 5 year limited |
Damp Location
Suitable for an exterior or interior location that is subject to condensation of moisture in, on or adjacent to electrical equipment
| Yes |
Rated for Fully Enclosed Fixtures
Not all LED bulbs are suitable for use in enclosed fixtures, due to the amount of heat they generate. Rated bulbs have been tested and approved as safe for enclosed fixtures.
| Yes |