... single red cost ,Website:http://www.hll-leddispaly.com, full color effect2. Timing Advantages: At present can get more profit ... than red color3. Quality Advantages: All use full color led lamps, higher brightness, longer life4. Effect Advantages: Can ... purple colors5. Special Card Advantages: Same cost as single color or tri-color control card, can fit for any screen except 7 color screen