About the Optics
Spot: 10 Degree (Narrow Beam) is a concentrated light pattern that is very narrow yet very long. This led light bar pattern produces more of an intense center spot to light up objects right in front of you, while sacrificing some side light. The Ultra Series 10 degree Spot Optics are great for long distance Highway driving.
Flood: 45 Degree (Wide Beam) is much wider LED light pattern than the Euro or Spot but has a significantly shorter reach. The Flood Beam is great for dispersing light and lighting up larger amounts of space on the track in front of you rather than far into the distance, making the Ultra Series led Flood Optics ideal for low range 4×4 driving and frequent off-road use.
Combo Beam : Both 10 Degree Spot and 45 Degree Flood combination, This is a great all round led light pattern giving you distance and flood light. Combo beam is the most popular and widely use on led light bars today.