* Goniophotometerand photometric test benches for automotive and lighting
DAPD you have to order mercury in energy-saving bulbs do not worry so Stiftung Warentest
Stiftung Warentest has tested solar energy-saving lamps. The quality differences are large. But already there is good lighting at an affordable price. Also to comment on the environmental testers.
In a test of energy-saving lamps, the Stiftung Warentest "very good" to identify "defective" lamps. The best results were obtained by two LED lamps, such as the Stiftung Warentest reported on Thursday in advance of their recent magazine "Test". However, they cost 45 or € 40 - so their use is worthwhile only where they are turned on and often long and so reduce the cost of electricity. Far more cost effective, four as "good" rated compact fluorescent lamps that cost between € 2.29 and seven. "When are the lamps are on sale are huge differences in quality," summarized the tester. "The range of sentences is great."
