The REED R8100SD-KIT is a data-logging light meter that measures ambient light up to 100,000 lux (10,000 foot-candles) with a clear backlit LCD display. This kit bundles the meter with an AC power adapter and an SD card, letting you record readings automatically at adjustable sampling intervals and pull the data straight into Excel with no extra software. Handy Data Hold and Max/Min functions make it easy to capture quick spot checks as well as long-term monitoring sessions.