The 300 means there are 300 LED chips on the entire spool when manufactured. This is a 3 foot section that is cut from that spool.
RGB Solderless Connector Installation Sheet
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1.Our 300 double densigy 5050 SMD LED flexible strip lighting uses just 4.4 watts per foot.
This means you can create amazing lighting effects and shows on low power consumption and electrical costs.
2. Our LED strip lights can change into almost any color!
Making possibilities endless and choosing a theme, accent, or light show easy and simple
3. You can bend the LED strip light up to 90 degrees.
This makes it very easy to install in corners, under cabinets, and surrounding architecture.
4. Our LED solderless connectors enable our clients to install the product without a background in Electronics.
The double sided adhesive that is attached to the back of the LED strip will mean that you can mount them efficiently without effort.
5. How is the 300 different than the 150 series?
Simply put, there are twice the amount of LEDs. Though the 300 will use more electricity, it is twice as bright as the 150 series. For LED strip applications where you will need a very intense color changing light, the 300 LEDs per reel will do more than you expect.
Specifications on the RGB 300 LED light strip
If you are just looking for RGB LED strip lights by the foot, then check out the product here