Omega 18W or 9W Clone LED Grow Lights (Twin Pack)Omega Clone LED Propagation Lights Its crazy efficient for just 18W you get 36umol S or 9W you get 17umol S. That makes them 60% more efficient than fluorescent clone lights and they last twice as long. In the current climate theyre a great way to stretch your budget. Other types of clone light just cant compete. Twin pack 2 x 18W or 9W propagation LED strips 2umol W efficiency (17umol S or 36umol S) Long life 54,000hrs 54cm x 2. 5cm x 3cm (L x W x H)