Why Are IK10 Vandal Resistant Bullet Cameras Uncommon?

It is very common to find Dome cameras with IK10 compliance in the market. However, it is not common in case of Bullet cameras. Most of the Bullet cameras that comply this need with External enclosure with IK10 ratings.

According to my study, a few Honeywell, Techwin Bullet cameras comply IK10 ratings without external case.

Why are IK10 ratings not common for bullet cameras? Is is because of the enclosure construction? opinions please

Honeywell's IK10 Bullet

Hanwha's IK10 Bullet

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