Affordability - Based on initial cost, additional accessories, warranty, and battery life expectency.

Capability - Based on operating time, adjustable beam, durability, light intensity, environmental conditions, battery charger, bulb or lamp type and mounting capabilities.

Deployability - Based on transportability, ease of deployment, attachment accessories, battery change-out and portable/mountable charger.

Maintainability - Based on changing bulbs, technical support, availability of spare parts, and cleaning requirements.

Usability - Based on ease of operation, operational switch, size, ease of charging and heat output.