The Type 4821 650 watt Molequartz® Tweenie II Solarspot® with circular channel construction for added strength and more efficient airflow resulting in cooler operation. Less heat on the fixture and lower seal temperature of the globe for longer life. Front opening door for easy globe access. New socket with quick globe release. Focusing knob on front and rear for focusing from spot to wide flood with smooth even field. Uses three globes 650 watt FRK, 500 watt FRG, or 300 watt FKW with 1.83" L.C.L. For use in motion picture, television and still photographic studios as a keylight, backlight or kicker.