NEEWER CN-600H Aluminum LED Photography Light 600 bulbs with Power Adapter Diffuser and Filter: Without diffuser and filter, light is of spotlight effect and suitable for shooting at a relatively long distance; with diffuser, light is of soft light effect; and with filter, the color temperature of light changes from 5600K to 3200K. Slots are designed on the front surface of the product to fix the diffuser and filter. Clamping Screws: To fix the light panel with U-bracket. U-bracket: To fix the light panel and adjust light direction. Dimmer Knob: For dimming, users can dim to suit different shooting conditions. Standalone Dimmer. For dimming conveniently when the light panel is placed at a high position.