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Matthew has a super LED lighting guide – “LED lighting is becoming increasingly popular in fish tanks, case mods, and even household lighting. This article intends to be a comprehensive guide to their advantages, powering them, and creating dimming solutions.” Link.

Pictured here, LEDs from HOW TO – Build a 1,024,000 mcd portable lightLink.

Related:
Tons of LED projects and more – Link.
HOW TO – Make a LED Blinky – Make 04, page 165.