Solarmeter 7.0 is great for estimating the the maximum session time a particular lamp will produce in a sunbed. This meter is also good for comparing lamp intensity in the same unit.
Wear eye protection when checking UV lamps (UV-block wrap around glasses)
Allow lamps to warm-up prior to taking readings (at least 5 min).
Hold sensor close to lamp or acrylic to measure individual lamp MED intensity. Hold sensor at 25 cm above bench with canopy closed for body position.