While UV can be dangerous, it all depends on which wavelength and what dose. Aerolamp uses a specific UV wavelength shown to be safe for human eyes and skin  at doses that are effective at killing germs.

Most germicidal UVC lamps are low-pressure mercury lamps that produce 254 nm UVC. Even a very low dose of 254 nm UVC can cause sunburn and snowblindness.

Instead, Aerolamp uses a filtered krypton-chloride lamp, which produces 222 nm UVC, considered by the American Conference of Governmental and Industrial Hygienists to be acceptable for human exposure at significantly higher doses.

Short answer: 1 for a typical room, or about every 250 square feet

Long answer: It's complicated

Unlike technologies like air filters, the efficacy of germicidal UV varies by pathogen. Some pathogens, like human coronaviruses, are very sensitive to far-UVC. Others are more resistant. However, there is significant uncertainty in just how sensitive various pathogens are to UV light.

The key metric to look for in all air disinfection technologies is the Clean Air Delivery Rate (CADR), usually given in cubic feet per minute (cfm). A typical high-quality portable air-cleaner has a CADR of around 400 cfm - a more typical one will deliver 200 cfm.

For a typical 250 square foot room with 9 foot ceilings, Aerolamp has an expected CADR of 200-1500 cfm, depending on the pathogen and the study referenced.

However, this estimate is based on a well-mixed room. In a room with very still air, performance will be worse than expected. Luckily, air mixing is readily accomplished with portable air purifiers, ceiling fans, or central ventilation. To ensure best performance, use Aerolamp in combination with a portable air purifier or other source of air mixing.

The dimmable Aerolamp may be set to a dim level of 20%, 40% or 70%. Otherwise, they are currently the same.

Both versions of the Aerolamp come with a millimeter wave radar to detect proximity and reduce output power to safe levels. Both work by turning off entirely when human presence is detected.

If the radar safety feature is not enabled, the dimmable Aerolamp may be helpful for spaces with very low ceilings.

Mount your Aerolamp at least 8.5 feet (2.6 meters) up. Ceilings are typically 9 feet high, but some may be 8 feet. You can use a microphone stand, tension rod, tripod, or anything else compatible with a 1/4" mount.

Tilt your Aerolamp to point at the opposite corner of the room. Position it so that the light covers areas where people spend time, and make sure that nothing is blocking the light.

If it is not possible to install your Aerolamp at least 8.5 feet up, you can do a few things to minimize any overexposure risk:

1. Tilt the lamp so it faces more towards the floor.
2. Install the lamp somewhere people usually aren't facing - for example, behind a couch, rather than above a television.
3. Enable the dimming safety features by pressing one of the buttons on the side of the lamp. Note that this is a demo feature that can be used to enhance safety, but is not intended to be a replacement for appropriate use.

Aerolamp has four settings: POWER, RADAR, INTENSITY (dimmable only) and DEBUG.

The top and bottom buttons in the 5-button interface move the cursor between these settings.

If the POWER or RADAR settings are selected, pressing the center button toggles them off. The right button always turns them on. The left button always turns them off.

If INTENSITY is selected, the left button decreases the intensity, and the right button increases it. The center button does nothing.

If DEBUG is selected, the center button shows you the firmware debugging screen. You usually shouldn't worry about this option. From the debug screen, pressing the center button returns you to the main menu. 

The screen will also show the lamp's TILT with respect to the floor. This readout may be helpful during installation, but cannot be interacted with.

Aerolamp achieves 95% reduction of coronavirus within 15 minutes and 99% reduction within 25 minutes, assuming one Aerolamp in a 250 square foot room.

This is about 3x faster than a high-quality portable HEPA air filter.

This figure scales. Two Aerolamps in the same space will work twice as fast, as will one Aerolamp in a 125 sq ft room.

Note that this is a highly uncertain figure, and that research is ongoing, but represents our current best guess.

Phone charger: no. Laptop charger: maybe, but probably not.

Aerolamp operates on 12V USB-PD, requiring a minimum of 2.5A. While some laptop USB-C chargers support this, many do not. Please check the label. Most phone chargers are unlikely to meet this specification. Fortunately, plugging in an incompatible USB-C power supply will not damage anything.

We are confident that your Aerolamp will last at least 10,000 hours, and likely 14,000 hours

Past 14,000 hours, your Aerolamp will still produce up to 70% of its initial output, but will be less and less effective over time.