Harvard 1 x 21W 2D Ballast

This is a High Frequency (Standard) ballast designed to run 21W lamps which is part of our control gear range

Harvard 1 x 21W 2D Ballast


QuickFind: 10534
Part No: DK21

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Harvard 1 x 21W 2D Ballast
This is a High Frequency (Standard) ballast designed to run 21W lamps which is part of our control gear range
Price
£29.31
Inc. VAT
£35.17
QuickFind: 10534
Part No: DK21

Product Summary

Harvard 1 x 21W 2D Ballast

from Harvard (Model: DK21)
A Harvard High Frequency Ballast

Technical Specifications

for Harvard 1 x 21W 2D Ballast
Ballast Type High Frequency (Standard)
Dimming? Non-Dimmable
Height 29 mm
Lamp 1 x 21W 2D
Lamp Type x 2
Lamp Wattage 21 W
Length 110 mm
No. Of Lamps Single (1x)
Type Control Gear
Width 41 mm

Part Codes

of alternative stock identifiers
DK21

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Glossary

Ballast

An Electrical Ballast is a device that is used to maintain the current in a circuit. Inductive ballasts are used with Fluorescent Tubes, Compact Fluorescents, Metal Halide, Sodium and Mercury light bulbs.


Electronic Transformer

An electronic transformer is used to reduce mains voltage to a suitable voltage for halogen light bulbs (Not to be confused with LED Drivers). When selecting a transformer it is important to ensure the max wattage is not exceeded by the total wattage consumed by the light bulbs.

Please Note: It is not recommended to "max" out transformers.

IE 5no. lamps x 10 watts each = 50 watts therefore a 60 watt (60VA) transformer would be acceptable, however if you had 6 lamps a 60 watt transformer would be "maxed" out. In this case we would then recommend a 105 watt (105VA) model.


Ballast Factor (BF)

In simple terms Ballast Factor is the percentage of the lamps lumens that the ballast is expected to emit. For example if a ballast had a ballast factor of 0.98 it would be emitting 98% of the lamps rated lumens.


Electromagnetic Ballast

The original type of ballast, the electromagnetic ballast was introduced with the first iteration of fluorescent lamps.


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17 Jan 18:07
LED purchase Jan 2017
Goods delivered promptly. All working as intended. Will order from BLT again.
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17 Jan 14:10
First Dealings with BLT
There proved to be problems with my order but this does not worry me. My concern is how a company deals with problems that will invariably arise. BLT could not have been more helpful and consulted me and offered further help and advice at each stage.