1. Flattering:
* Soft: Minimizes harsh shadows, wrinkles, and imperfections. Think of it as diffused light – spread out and gentle.
* Even: Light is distributed relatively evenly across the subject's face, avoiding bright spots and deep shadows.
* Directional (but not harsh): The light should have a direction, creating some shaping and definition, but without creating unflattering shadows.
2. Controlled:
* You have a degree of control over its intensity, direction, and quality (softness/hardness). This is crucial for manipulating the light to your artistic vision.
3. Appropriate for the Subject and Mood:
* A bright, sunny portrait might be perfect for a happy, outdoor shot, but less ideal for a moody, introspective image. The "goodness" of the light is context-dependent.
Types of Good Light for Portraits and How to Use Them:
Here's a breakdown of different types of good light, with tips on how to use them:
A. Natural Light:
* Open Shade: This is generally considered the *most* flattering natural light. It's found in areas shaded from direct sunlight but still illuminated by the surrounding light (e.g., under a large tree, in the shadow of a building, or under a porch). It provides soft, even light with minimal harsh shadows.
* How to Use It: Position your subject so that their face is evenly lit, avoiding patchy shadows from leaves or other objects. Use a reflector to bounce light back into their face if needed, filling in any shadows under their eyes or chin.
* Golden Hour: The hour after sunrise and the hour before sunset. The sun is low on the horizon, casting a warm, soft, and directional light.
* How to Use It: Experiment with different angles. Shooting with the sun behind your subject (backlighting) can create a beautiful rim light and a dreamy, ethereal feel. Use a reflector or fill flash to illuminate their face. Shooting with the sun to the side creates nice shaping.
* Overcast/Cloudy Day: The clouds act as a giant diffuser, softening the sunlight and creating a very even, shadowless light.
* How to Use It: This light is very forgiving. Focus on composition and expression. Be mindful of the direction of the light – even on a cloudy day, the light can be slightly brighter from one direction. White balance can be tricky; adjust in post-processing.
* Backlight: Light coming from behind the subject.
* How to Use It: Careful exposure is crucial. You may need to use a reflector or fill flash to brighten your subject's face, or expose for the highlights and let the subject fall into silhouette. Backlight can create beautiful rim lighting around your subject.
B. Artificial Light:
* Studio Lighting: Strobe lights with modifiers (softboxes, umbrellas, beauty dishes) offer the most control over the light.
* How to Use It:
* Softboxes: Create soft, diffused light. The larger the softbox, the softer the light.
* Umbrellas: Similar to softboxes but generally create a slightly wider and less controlled spread of light.
* Beauty Dishes: Create a more specular (slightly harder) light with a distinctive look.
* One-Light Setup: Start with one light and a reflector. Position the light to the side and slightly above your subject. The reflector bounces light back into the shadows.
* Two-Light Setup: Use a key light (the main light source) and a fill light (to fill in the shadows created by the key light).
* Continuous Lighting (LED panels, lamps): Provide a constant source of light, making it easier to see the effect on your subject in real-time.
* How to Use It: Similar principles to studio lighting apply. Use modifiers like softboxes or diffusers to soften the light. Be aware that continuous lights are often less powerful than strobes, so you may need to use higher ISO settings or a wider aperture.
* Flash (On-Camera or Off-Camera): A versatile tool for adding light or filling in shadows.
* How to Use It:
* Bounce Flash: Direct the flash towards a ceiling or wall to create softer, more diffused light.
* Off-Camera Flash: Position the flash away from the camera to create more directional and interesting light. Use modifiers like umbrellas or softboxes.
* Fill Flash: Use a small amount of flash to fill in shadows, especially when shooting outdoors in bright sunlight.
General Tips for Using Good Light:
* Observe the light: Pay attention to how the light falls on your subject's face. Look for highlights and shadows.
* Position your subject: Move your subject around to find the most flattering light.
* Use reflectors: Reflectors are inexpensive and invaluable for bouncing light back into your subject's face.
* Use diffusers: Diffusers soften the light, reducing harsh shadows.
* Control the light: Use curtains, blinds, or other objects to block or modify the light.
* White Balance: Ensure accurate white balance to avoid color casts. Shoot in RAW format to easily adjust white balance in post-processing.
* Post-processing: Use photo editing software to fine-tune the light and shadows in your portraits.
* Practice: The more you practice, the better you'll become at recognizing and using good light.
* Understand Light Direction: Light coming from above can create unflattering shadows under the eyes and chin. Light coming from below can create a spooky or unnatural look. Light from the side is often more flattering, creating shape and dimension.
In summary, "good light" is about creating flattering, controlled, and appropriate illumination for your subject. Mastering light takes practice, experimentation, and a good understanding of the different light sources and modifiers available to you.