14D
every 30/60 days.
Fresnel lens:
Clean the lens with neutral soap and water, and then dry it with soft cloth. Be
aware that alcohol or other detergent could cause damage to lens. Please note the
lens would be burnt yellow or cracked after three-month use of average 8 hours
per day, which can reduce the output in some degree. The lens is consumable with
a warranty of three months only. Please change with genuinely new lens when
necessary.
