e-Freak
Jul12-04, 10:30 AM
1. How can calculate how much light does a florissent lamp produce ? or what formula to use to calculate it ?
2. How can calculate how much light does a battary that works on light needs to work fine ? or what formula to use to calculate it ?
2. How can calculate how much light does a battary that works on light needs to work fine ? or what formula to use to calculate it ?