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Bar Downlights (LED's)

LED's (1W, 350mA white) are used for downlights on a home bar. This utilises the same circuit constructed for the strip lighting of my electronics workbench.

My home bar (see photograph below) has an above eye-level shelf for hanging glasses, but this makes storing other items on this shelf area dangerous as an uneven surface is created by the inverted glasses. Further, any overhead lighting in this area (such as a small fluorescent tube) is blocked and does not illuminate the work surface below.

the bar

A small 'shelf' that sits over this area would solve the problem of the uneven surface, but not the lighting difficulty. A seperate project resulted in strip lighting to illuminate my electronics workbench. By utilising the same circuit and using high power white LED's, 'downlights' could be installed in this 'shelf' to provide the desired lighting.

Such 'downlights' from LED's would be economical to operate, easily 'concealed' in the shelving thus being un-obtrusive, and utilising the hanging glasses as 'lenses' also create a pleasing 'ambience'.


The circuit used to power the LED's is the same as that used in the strip lighting project.

The only difference being in the actual physical mounting of the LED's, which is described in the Construction Nodes/Troubling Shooting Section below.


The circuit used to power the LED's is the same as that used in the strip lighting project.

Please refer to that project page for details about the schematic diagram etc.


The circuit used to power the LED's is the same as that used in the strip lighting project.

Please refer to that project page for details about the PCB etc.


The circuit used to power the LED's is the same as that used in the strip lighting project. The bill of materials is re-produced below for reference.


Qty Schematic Part-Reference Value Notes
Resistors
1R1100K1/4W, 10% 
1R21 ohm1/4W, 10% 
1RV1100 ohmPotentiometer
Diodes
4D1-D4White LED1W, 350mA LED's 
Transistors
1Q1BC547small signal NPN 
1Q2FQP13N10MOSFET n-channel 
Miscellaeous
1SW1switchSPST
Description Downloads
LED Strip Lights Bill of Materials Text File Download

The circuit was originally constructed on breadboard to enable spot checking of voltage and current at various points in the circuit.

The circuit used to power the LED's is the same as that used in the strip lighting project.

Please refer to that project page for details about testing the circuit.


The circuit used to power the LED's is the same as that used in the strip lighting project.

The only difference being in the actual physical mounting of the LED's.

The Photographs Section shows how a wooden shelf was constructed to fit within the over-head storage area of the bar-unit. Within this wooden shelf a slot was cut to provide a conduit to house the LED's and associated cabling.

Each LED was mounted so that the 'down-light' so formed coincided with a position available for hanging of wine glasses etc. This enabled the glasses to provide in consequence a 'lens' effect, which created a pleasing 'ambience' rather than just a straight 'spot light'.


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Comments/Questions (2)

Topic: Bar Downlights
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firefly999 says...
what as the cost of the flexible plastic PCB type material you used (and can you recommend a supplier) ... thanks
20th June 2015 5:35pm
FadsToObsessions says...
I got the flexible PCB material from 3M a few years back. Depending upon how much you want, I'm open to sending you some (for a price + postage), let me know via PM using the contacts page.
24th June 2015 5:27pm
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