The performance of an LED in terms of spread or reach is more weighted towards the lens design. The lens is what brings most of the light into "focus"
When comparing round vs bar, the specs of each must be the same in order to make a fair comparison. So the lens and reflectors all have to be the same. Having said that, the amount of light emitted by a set of LEDs will depend on the pattern that it is arranged in.
In order to double the intensity of a light, you would need to double the qty of the light source at every step. i.e. 1, 2, 4, 8, etc. In a round light, the pattern of the LEDs from an almost circular pattern where each ring of light is compounding the brightness of the entire round light. In a lightbar, the LEDs are arranged linearly so the LED at the extreme end doesn't really overlap the one right in the middle. In this case, there is more spread but the brightness appears lower, which is in contrast to a much brighter spot in a round light.
Also, many 20" light bars which can fit in between the uprights of a bullbar are around the 180W mark. Compared to the 9" LED spotties which are 185W each, there is twice the amount of light with 2 9" spotties vs 1 20" light bar.
In terms of placement, lightbars should be placed up high to maximise its spread. Otherwise a lot of the light will fall directly onto the ground in front of the vehicle which isn't very useful.
When comparing round vs bar, the specs of each must be the same in order to make a fair comparison. So the lens and reflectors all have to be the same. Having said that, the amount of light emitted by a set of LEDs will depend on the pattern that it is arranged in.
In order to double the intensity of a light, you would need to double the qty of the light source at every step. i.e. 1, 2, 4, 8, etc. In a round light, the pattern of the LEDs from an almost circular pattern where each ring of light is compounding the brightness of the entire round light. In a lightbar, the LEDs are arranged linearly so the LED at the extreme end doesn't really overlap the one right in the middle. In this case, there is more spread but the brightness appears lower, which is in contrast to a much brighter spot in a round light.
Also, many 20" light bars which can fit in between the uprights of a bullbar are around the 180W mark. Compared to the 9" LED spotties which are 185W each, there is twice the amount of light with 2 9" spotties vs 1 20" light bar.
In terms of placement, lightbars should be placed up high to maximise its spread. Otherwise a lot of the light will fall directly onto the ground in front of the vehicle which isn't very useful.
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