Thanks for the reply.Yes they both have an adjustment knob.The one that is pictured on the right has printed on the board where to hook up the + and - from the battery also where to solder in the bulbs.Its the one on the left thats does not have any info as to where to connect the battery ect,Whats kinda throwing me off is on the one pictured on the left what connects under the three screws. Thanks !!