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OT: Can someone help me with LED Lights in a display cabinet

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My 9-year-old daughter likes to collect "jewels". Really just large pieces of glass cut into diamond shapes with lots of facets. She wants me to make her a display cabinet with lights under them so they glow.

I priced out a commercially made LED lights and controller and it would be over $200. Seems like a lot for 12 LED's and a wall wart.

I found the URL below which gives me almost all the information I want to know. The LED's I'm looking at are clear white 1800mcd and have a forward voltage of 3.5V @20mA. According to the calculator I would need a 50V transformer.

Instead of running them all in series, can I run a series parallel configuration? For example:
      |-- 82R -- LED -- LED -- LED 
      |
      |-- 82R -- LED -- LED -- LED
12V --|
      |-- 82R -- LED -- LED -- LED 
      |
      |-- 82R -- LED -- LED -- LED
Thanks for your help.
LED Resistor Calculator (Open in New Window)

Follow Ups:

12v auto LEDs on eBay - colinhester 09:14:25 09/16/09 (1)
I spent very little money and had a lot of fun with the kids this summer pimping their electric riding toys. eBay is a great source. Look for 12v LEDs in the auto section. You can buy strings, plates, single prewired w/resistors - just about any you can imagine. Most items are shipped from HK and arive in a couple of weeks. I bet I made 20 orders for lights (always had neighbors' kids asking me to trick out their ride) and never a single problem.......C
- The price is right - dbishopbliss 11:17:07 09/17/09 (0)
  just have to decide if I want to wait a few weeks to get them.
I Think You Are Right ! - Grainger49 10:57:29 09/15/09 (1)
I calculated 75 ohms to drop the extra 1.5V. You need 0.8A from the power supply but be conservative, get more.

Your idea will allow you to place the lights exactly where you want them.

Remember, YOU are the only one who needs to be happy with the sound of your system

Grainger Morrison
There Is Only One (Grainger Morrison, it seems)
- Just found this - dbishopbliss 17:27:28 09/16/09 (0)
  just plug in the numbers and it does all the work.
  - LED Wizard by Rob Arnold (Open in New Window)
Inexpensive LED light bars... - Cameron Etezadi 10:09:04 09/15/09 (0)
Try Ikea... their "Dioder" for $50 is a great little product. It's four sticks of high intensity RGB diodes that can be connected to either a hub (four ports) or end-to-end in any configuration that you want. It also comes with a controller for it that will turn it through any of eight colors.

Relatively cheap, very compact, and exactly what you want...
- http://www.ikea.com/us/en/catalog/products/50119407 (Open in New Window)
RE: OT: Can someone help me with LED Lights in a display cabinet - RayP 12:22:56 09/14/09 (0)
Maybe I'm not understanding your request correctly, but could a string of Xmas lights do the job if they are not too big in size? Hide the ones you don't need if there are too many on the string.

ray
Not LED's but might work for your project. - thermionic addictions 10:18:54 09/14/09 (0)
Not sure what size of a display you are building but a few of these
should light it up.
They run off wall voltage too:)
Cal
- http://www.allelectronics.com/make-a-store/item/EL-13/EL-BAC (Open in New Window)
Edits: 09/14/09

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