03/15/2010 DMF Lighting is pleased to offer several products that are ARRA/Buy American compliant. Read Full Article
06/02/2009 Why do transformers hum?
The short and simple answer is that transformers hum because of an effect known as 'lamination rattle' caused by DC voltage on the line or poor construction or both. 'Lam' rattle occurs in all transformers to some degree, that degree being related to the quality of the transformer and the quality of the line voltage
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06/02/2009 The New Way to Start a Fluorescent Lamp
Fluorescent lamp and electronic ballast systems are widely used today because of the energy they save. However, when they are used in applications where they are cycled on and off frequently, lamp life can be reduced, no matter what type of ballast is installed – instant or rapid start. Now there is a new ballast technology that can extend fluorescent lamp life by more than 50 percent in these application scenarios, reducing energy and replacement costs.
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06/02/2009 The LED Summary
A Light Emitting Diode (LED) is a semiconductor device which converts electricity into light. LED lighting has been around since the 1960s, but is just now beginning to appear in the residential market for space lighting. At first white LEDs were only possible by "rainbow" groups of three LEDs -- red, green, and blue -- by controlling the current to each to yield an overall white light. This changed in 1993 when Nichia created a blue indium gallium chip with a phosphor coating that is used to create the wave shift necessary to emit white light from a single diode. This process is much less expensive for the amount of light generated.
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