Different spells will affect light in various ways. Harath uses Lux to determine the amount of light that something generates. 1 Lux is equivalent to 1 sq meter of light. The following chart gives some common values generated by the formula = 10(Mana/20):
| Power | Lux | Indoor Scale (3m distant) | Outdoor Scale | Spaces | Visibility |
|---|---|---|---|---|---|
| 0 | Total Darkness | 9 penalty to visual tasks | |||
| 0.00001 | Near Total Darkness | 8 penalty to visual tasks | |||
| 0.0005 | Moonless, cloud covered night | 7 penalty to visual tasks | |||
| 0.002 | Starlight, no moon | 6 penalty to visual tasks | |||
| 0.01 | Starlight, 1/4 moon | 5 penalty to visual tasks | |||
| 0.05 | Moon below Half | 4 penalty to visual tasks | |||
| 0.2 | Moon above Half | 3 penalty to visual tasks | |||
| 1 | 1.12 | Candle | Deep Twilight | 2 penalty to visual tasks | |
| 5 | 1.78 | Nightlight | Late twilight on a cloudy day (6:30 PM Feb in VA) | +5 Hide in Shadows | |
| 10 | 3.16 | Alarm Clock | Early twilight on a clear day (6:30PM Feb in VA) | Residential Walkway | +4 Hide in Shadows; 1 penalty to visual tasks |
| 15 | 5.62 | Nightlight | Pedestrian walkway | Pedestrian walkway | +3 Hide in Shadows |
| 20 | 10.00 | 15 watt incandescent bulb | Well lit street at night | Commercial Walkway | +2 Hide in Shadows |
| 25 | 17.78 | 25 watt incandescent bulb | Parking Deck Lighting | Street Intersection | +1 Hide in Shadows |
| 30 | 31.62 | 30 watt incandescent bulb | Sun on a clear day (1810 Feb in VA) | Sidewalk | Min reading |
| 35 | 56.23 | 40 watt incandescent bulb | Pump Island at Gas Station | Stairs, Ramps | |
| 40 | 100.00 | 60 watt incandescent bulb | Very Dark Overcast Day | w/in 3 m of ATM | Casual Seeing |
| 45 | 177.83 | 100 watt incandescent bulb | Sun on a clear day (0640 Feb in VA) | Outdoor merchandise display | Some perception of details |
| 50 | 316.23 | 150 watt incandescent bulb | Classrooms | Moderately easy visual tasks; Reading | |
| 55 | 562.34 | 60 watt Fluorescent light bulb | Office Building | Moderately difficult visual tasks | |
| 60 | 1,000.00 | Computer Projector | Overcast Day | Treatment Rooms | Very difficult visual tasks |
| 65 | 1,778.28 | Studio Lighting | Stadium Lighting | TV Studio | Extremely difficult visual tasks |
| 70 | 3,162.28 | Dental Lighting | Dental Office | Exceptionally difficult visual tasks | |
| 75 | 5,623.41 | Grow Lighting | Dental Office | -1 Hide in Shadows | |
| 80 | 10,000.00 | Grow Lighting | Sun on a clear day (0900 Feb in VA) | -2 Hide in Shadows | |
| 85 | 17,782.79 | Sun on a clear day (1000 Feb in VA) | -3 Hide in Shadows | ||
| 90 | 31,622.78 | Sun on a clear day (1100 Feb in VA) | Operating Room | -4 Hide in Shadows | |
| 95 | 56,234.13 | Operating Room | Sun on a clear day (1200 Feb in VA) | Operating Room | -5Hide in Shadows |
| 100 | 100,000.00 | Sun on a clear day (1200 Feb in VA) | |||
| 103 | 141,253.75 | Sun on a clear day (1200 Feb at the equater) |