Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
I've bought quite a few LEDs from this company. Never been disappointed with the brightness. Usually need to purchase 50 pieces of an item to get the best price. Shipping isn't bad either, but you have to wait about 2 weeks.
About 10 years ago I bought Hewlett-Packard blue and green very bright LEDs with a 30 degrees angle that were made for traffic lights and pixel screens.
Then they became Agilent.
Now they have another name.
I think Digikey still sells the same ones. They are matched with codes for colour tint and brightness.
In this case the viewing angle is not needed because matrix signboards likes narrow focussed type LED's.But most important is required current other than angle to minimize the external drivers to drive the matrix display.
Signboards that use wide-angle LEDs can be seen by many people at different angles.
Signboards with narrow-angle LEDs are seen by only a few people directly in front.
Which is best?
Viewing angle about 30 deg or below is the best. Not too much wide angle for sign boards.
Why is that?
When LED’S are placed in very closely to each other, if the LED has too much viewing angle the light covers the neighbor LEDs which is in the surrounding area. At this time display looks like smudged. It’s reducing the smoothness of the character or the sign.
Especially at night times.
Ready made LED matrix doesn’t have this trouble because each LED is separating by the mould (separators). So the light wont come to any neighbor LED’S. That’s why I always use matrix LED’s.
Home made LED matrix panels must use narrow angle LED’s.
If that link does not work you can see the ad on the left side of www.hackedgadgets.com for them. They are all rated for 20mA, but should still be pretty bright at 12mA.
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