> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# Round Semi-Circle Backlight LED - 50mm Diameter

**Type:** Product page · **SKU:** ADA4882 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia)
**Page:** https://core-electronics.com.au/round-semi-circle-backlight-led-50mm-diameter.html ([markdown](https://core-electronics.com.au/round-semi-circle-backlight-led-50mm-diameter.html.md))

These pretty circles of light are plastic diffused backlights, probably originally used in LCD gauge displays. Normally they're tucked behind the LCD and shine white light from below. Here, we've got the LEDs available individually, and they're really cool! Each LED is encased in a 2.2mm thick semi-circle of acrylic. The acrylic is a special type that is very good at diffusing light, so even though there are only two white LEDs, it provides near-uniform lighting. The other flat side of the diffuse has a reflector on it so you only get light from the top (otherwise the backlight would lose 1/2 the brightness unnecessarily)

## Pricing

- **Price:** $5.90 (inc GST) — $5.36 AUD, exc GST
- **Quantity discounts:** 10+ $5.20 (exc GST) · 50+ $5.09 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Sep 07 and Sep 09.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=ADA4882:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/ADA4882:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

These pretty circles of light are plastic diffused backlights, probably originally used in LCD gauge displays. Normally they're tucked behind the LCD and shine white light from below. Here, Adafruit have got the LEDs available individually and they're really cool! Each LED is encased in a 2.2mm thick semi-circle of acrylic. The acrylic is a special type that is very good at diffusing light, so even though there is only two white LEDs, it provides near-uniform lighting. The other flat side of the diffuse has a reflector on it so you only get light from the top (otherwise the backlight would lose 1/2 the brightness unnecessarily)

You can treat this 50mm diameter backlight just like an LED, light with ~3V at 30mA current, and you get a pretty shape that you can mask with vinyl or draw over with a marker. Gels can be used to change the color. We think these would make great wearables without the need for EL or inverters. They're much brighter than EL and use less battery. The trade-off is these are not flexible at all.

[Datasheet](https://core-electronics.com.au/attachments/localcontent/4882_KWB-C50-P2W__1__9301872453e.pdf)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/4/8/4882-00.jpg)