Commercial combination steel signs and battery units eliminates light leaks combined with a simple, easy to install design. Two PAR18 small style, front mounted heads are standard, PAR36 large style or MR16 type are optional Commercial combination steel signs and battery units eliminates light leaks combined with a simple, easy to install design. Two PAR18 small style, front mounted heads are standard, PAR36 large style or MR16 type are optional