Definition of Light Bulb Beam Angle:
The beam angle is measured between the points on opposite sides of the beam axis where the intensity drops to 50% of maximum intensity.
| Description | Code | Typical Beam Angles |
| Very narrow spot | VNSP | <15 degrees |
| Narrow spot | NSP | 15-30 degrees |
| Spot | SP | 30-60 degrees |
| Narrow flood | NFL | 60-90 degrees |
| Flood | FL | 90-120 degrees |
| Wide flood | WFL | 120-160 degrees |
| Very wide flood | VWFL | >160 degrees |
Very Narrow Spot (VNSP) The very narrow spot is just like it sounds. At 15 degrees or less, light casts an intense, focused beam with a far reaching beam. These type of lights are ideal for head lights and search torches. Narrow Spot (NSP) Like the very narrow spot, the narrow spot is most popular when a balanced beam is required with both flood and spot elements. The reflector casts a beam slightly less focused than a VNSP. Not as intense as the VNSP but it covers a larges area at a distance. Spot (SP) The spot is the basis for directional light. Most people confuse a spot with a VNSP or NSP. Most spots are better suited for work lights which need to illuminate area of interest at a distance where work needs to be done. The beam pattern typically is not that intense with a gradual change over to flood. Floods The wider the flood, the less reach the light has, but it is distributed more evenly. To illuminate a large area requires exponentially more light. Due to this floods appear less impressive at night compared to lesser output spots. Floods are better suited for work lights, which do not require a far reaching beam.