Recent content by James Jackson

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  1. J

    Portable Display light, LM3914 Question

    Nice idea, and layout of the components. I may not be seeing something, but... if I understand correctly, you have the LM3914 connected so that it will disable the C-C Driver when the battery drops to 10.5Volts. Correct? A 10.50 Volts - this is considered 100% 'dead'. If I understand...
  2. J

    Anything new out for outdoor lighting, such as a porch light?

    Well... you're most likely only interested in 120VAC lighting. I have a porch light that is 4 Amber LEDs - and runs off of a 12-Volt SLA battery. The battery is recharged by a solar panel and charge controller. There is not light switch - I use an Infrared controller to turn it on and off...
  3. J

    A Design Challenge for Anyone Interested

    If it were me, and I were building this - from scratch - I would attach the 1 - 3 Watt LEDs directly to (or through the printed circuit board) copper tubing, and 'pipe' this tubing up and down the wall. I would then plumb the tubing into the watering system for the plants, running cool water...
  4. J

    12V lighting for off-the-grid cabin

    Howdy! 10 x 14 ain't that large and is possible to illuminate the way that you are wanting to do - using a small 12-Volt system. I have been using a small system for almost 3 years now, and the LED lighting is doable. There are a couple of approaches that you could consider... 1) Using a...
  5. J

    12-Volt Amber LED Porch Light

    I just got the shipment of the 5 Amber LEDs that I ordered today, that I am going to use in my next Amber LED Porch Light. They are supposedly 38 Lumens per Watt. I powered one up using my current-limited power supply... it's bright! Serial #002 of my Porch Light is about to happen. Regards...
  6. J

    12-Volt Amber LED Porch Light

    Good question. We used to have some thermal epoxy here at work, that I was hoping to use - but it 'expired' and got tossed. So, I went to the local automotive store and got some 2-part epoxy that comes in a tube. It is kinda tricky to push the plunger and get equal amounts to dispense, but it...
  7. J

    12-Volt Amber LED Porch Light

    Thanks for the positive replies and comments. No - I do not have a photo of it in the final location - where it will be used. According to my friend, it is on a 4x4 10-foot tall pole - using a porch light fixture - I imagine a round glass globe that attaches to the socket with three or four...
  8. J

    12-Volt Amber LED Porch Light

    Howdy folks. Here is my latest project that I just finished (the epoxy is barely dry). A friend at work has a solar panel and charge controller attached to a 12 Volt battery, and uses 12 Volt bulbs for lighting his front porch at his country property. He wanted an LED 'lightbulb', and I...
  9. J

    My attempt at home interior lighting

    Jason, Thanks for your positive words. The IR circuitry got real simple when I went to using the Basic Stamp for the controller. It's basically the type of IR component that you can get at Radio Shack - that puts out a digital signal. The previous generation of this concept uses discrete...
  10. J

    My attempt at home interior lighting

    Good question. Using the recently retired 17Ah 12V SLA battery, which is about 3 years old, I was getting 2 to 3 hours of usage before the battery went down to about 12.4 volts - which is slightly lower than I like to go. I now have a 35Ah 12V SLA wheelchair battery that I got on ebay. It's...
  11. J

    My attempt at home interior lighting

    If it sounds like I am being defensive - perhaps you should re-read the questions. They appear to be attacking my design - which is working. The 'help' being offered only seems to be that I need to do it differently - or that it is not working - which is incorrect. I have taken the time to...
  12. J

    My attempt at home interior lighting

    Looking at this data, it appears to be from 2006 - or earlier. High-Power LED technology has improved tremendously since 2006. I have been working with High-Power LEDs since about 2002 or so. Back then, the Hi-Power LEDs were at about 25 to 30 Lumens per watt - if that. The ambient was in an...
  13. J

    My attempt at home interior lighting

    Dave... ummm... you may want to take a closer look at the photos that I posted. There is more to my heatsink than just 1 oz copper on the PCB. Lots of good words... but they mean nothing - as I am getting lots of LED light output. I know that you may be knowledgeable and all... Regards...
  14. J

    My attempt at home interior lighting

    Dave, I'm curious as to why you feel that most of the power is going into heat? I have measured the heat on the LEDs - and it does not go above 110F - well within allowable temps for the LEDs. Also, remember - I am not using an aluminum heatsink - I am using copper, which is much more suited...
  15. J

    My attempt at home interior lighting

    More photos - I've finished the second LED Light Tube. This first shot is of the two LED Light Tubes mounted on the wall. Note the lenses. Inner ones are 6-degrees, next are 15-degrees, and outside ones are 30-degrees. The next photo is of the LED Tube lit up. It draws about 1.4 Amps at...
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