21st Century Security and CPTED, 2nd Edition

733Lighting Provides Choice

For the greatest energy efciency and best color rendering, security lighting should employ either

uorescent T-8 or T-5 linear lamp technology with electronic ballasts. The latest T-8 lamps, called

second generation, produce more than 10% more light per watt than the original T-8 lamps and

50% more light per watt than the old T-12 lamps (still the most commonly used lamps in older

schools). The second-generation T-8 lamps are currently about 30% more expensive than ordinary

T-8 lamps, but their superior color and light output are worth the cost and they last about 20%

longer. In a typical classroom, the added cost ...