Arduino Forum

Using Arduino => LEDs and Multiplexing => Topic started by: WilliamK Govinda on Sep 10, 2012, 07:05 pm

Title: Help me chose the right LED? 4 x 4 square grid with acrylic top
Post by: WilliamK Govinda on Sep 10, 2012, 07:05 pm
Guys, please, I'm building a 4 x 4 LED square grid. So, I will build a 25 cm x 25 cm box with 3 separations horz. e 3 vertically. So, in total, we will have a 4 x 4 square grid. (16 squares)

Each square will have a red led. On top, a white-frost acrylic, so now I need to figure out which led will be best. So I get good illumination and also a good view angle, so it just don't show a red dot, but an uniform red square.

Here are some leds from eBay, if you find better ones (only eBay) please let me know, ok?

http://www.ebay.com/itm/100-pcs-5mm-straw-hat-Red-LED-Wide-Angle-20000MCD-/120496125516?pt=LH_DefaultDomain_0&hash=item1c0e20f64c

http://www.ebay.com/itm/100-pcs-Red-5mm-straw-hat-LED-Wide-Angle-Light-Lamp-Free-Shipping-/170842661548?pt=LH_DefaultDomain_0&hash=item27c70422ac

http://www.ebay.com/itm/100Pcs-5mm-Flat-Top-RED-LED-Wide-Angle-Light-LED-/260520802647?pt=LH_DefaultDomain_0&hash=item3ca83ff957

This leds I already have here, but the V.angle are terrible.
http://www.ebay.com/itm/100-pcs-5mm-Red-LED-Lamp-Ultra-Bright-Free-Resistor-EMS-/160557816658?pt=LH_DefaultDomain_0&hash=item2561fddb52

Thank you for any advice.

Best Regards, WilliamK
Title: Re: Help me chose the right LED? 4 x 4 square grid with acrylic top
Post by: WilliamK Govinda on Sep 10, 2012, 07:15 pm
Here's a 8000mcd one (100lm) which is nice, BUT, its too pricy, and I don't get how I can solder it, will I require some special PCB? Why so much current compared to the other ones?

http://www.ebay.com/itm/50pcs-1W-Red-LED-Without-board-Star-HIGH-POWER-100LM-140-light-DIY-S-/390408239164?pt=LH_DefaultDomain_0&hash=item5ae624f83c
Title: Re: Help me chose the right LED? 4 x 4 square grid with acrylic top
Post by: WilliamK Govinda on Sep 10, 2012, 07:22 pm
Hummm, I'm also wondering on using white-leds, as they have better mcd, and just check if the acrylic supplier have other frosted colors. ;-)
Title: Re: Help me chose the right LED? 4 x 4 square grid with acrylic top
Post by: WilliamK Govinda on Sep 10, 2012, 07:30 pm
Here's some white leds, they are 20kmcd (20000mcd) which is much nicer. I could just use the frosted-white acrylic or maybe try some blue, red, green, yellow, and see what looks nicer. ;-)

http://www.ebay.com/itm/200-pcs-5mm-Straw-hat-white-LED-Wide-Angle-Light-lamp-/120757955281?pt=LH_DefaultDomain_0&hash=item1c1dbc2ad1