True or False: A smaller back-up light is useful if your primary light fails.

A smaller back-up light can indeed be useful if your primary light fails. In diving, particularly during night dives or in low visibility conditions, having a reliable source of light is critical for navigation and safety. While a smaller back-up light may not provide the same intensity or range as a primary light, it can still offer enough illumination to help divers find their way or signal for assistance.

Additionally, a smaller back-up light is often easier to carry and conserve battery life, making it a practical choice for divers. This is especially important when considering the possibility of extended dive times where conserving energy becomes factor. Therefore, having a smaller back-up light ensures that divers are well-prepared for unexpected situations, enhancing safety underwater.