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Old 04-14-2011, 01:56 AM   #11
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This post is in reference to an 1141 bulb.

At 5 ohms I'm measuring 6.8volts.....approximately 1/2 the voltage, and approximately 1/2 the brightness. I'll use a 7 or 8 ohm resistor for the 3/4 brightness position.

Heat is a concern. After several minutes under power, I have no difficulty holding the resistor in my hand, the bulb is noticeably hotter.

I'll double check the entire assembly at length for heat before I enclose it in the fixture.

Didn't mean to give the impression that this will work with an LED. Eventually I'll find a small array of LED's that will give me the half brightness I'm looking for. When I learn more about LED's, I'll probably build my own boards, which will also greatly reduce the energy draw, as opposed to the incandescent bulb/resistor.
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Old 04-14-2011, 03:15 AM   #12
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What about painting the inside of the lens white? I am thinking of doing this to the light over the head of my bed.
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Old 04-14-2011, 12:12 PM   #13
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The "dimmer knob in your house" is actually a thyristor which only works on AC. It wouldn't work on 12VDC.
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Old 04-14-2011, 12:57 PM   #14
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Hot resistor !!!!!!

Windrider is 100% correct about the resistor getting hot. Better make sure the resistor is not touching anything that is combustible . Why not just use a lower wattage bulb?
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Old 04-14-2011, 05:37 PM   #15
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Well, the answer to my situation was found at Walmart....

"ritelite" wireless led puck. 2 brightness settings, auto-on for use in cabinets or closets, and selectable direction of light.

Who'd thunk????

$6.97

Don't particularly care for battery operated (3 AAA), but this just might do what I need in both tv and bedroom locations.
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Old 04-14-2011, 06:48 PM   #16
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Quote:
Originally Posted by Shasta1 View Post
Is there a resistor that can be used to cut 12v in half?

I'm wanting to dim a couple of bulbs to half brightness.... is there a simple and inexpensive solution to this? The bulb is the 1141 size base.
use a lo93 bulb instead, it is 9.3 watts, much dimmer
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Old 04-15-2011, 12:39 PM   #17
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Thanks ohcnda!

Excellent suggestion. Where do I find these?

I did a search and it seems that this bulb is used in landscaping lighting and pools. I'll check the Home Depot, Lowes, and Ace type stores.

Thanks!
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Old 04-15-2011, 08:47 PM   #18
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Here's a chart showing most DC incandescent bulbs and their voltage/wattage (CP)...

Bright Future International Ltd-Auto bulbs, Halogen bulbs, Incandescent bulbs, Miniature bulbs, Indicator bulbs, Night bulbs, Neon bulbs, Telephone bulbs LED bulbs.

Enjoy.

John
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Old 04-18-2011, 01:22 PM   #19
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That lo 93 bulb is rather elusive.....haven't found one yet.
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Old 04-22-2011, 01:31 PM   #20
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I found some lower wattage bulbs at automotive store, drastically reduced the amount of heat and still has plenty of light, original bulbs deformed the lens when child placed blanket over fixture in bunk. very happy with the lower wattage bulbs.
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