Just bought 4 ea 40W CFL bulbs for about $4.50 that last 9 yrs at 3 hrs/day.
Math Question: which bulb(s) are less expensive for 10 years?
LED = $13 dollars assuming 12 hrs/day usage
CFL = 12 hrs/day usage makes life 9 yrs/4 = 2.25 yrs life for one x 4 bulbs = 9 yrs life for $4.50 PLUS additional energy cost by CFL bulbs.
might be a total push?
Incandescent bulbs last about .9 years/4 or about 3 months and cost about $2.50 each or $100 for the bulbs in 10 years plus 7 times the energy cost. $280 vs $40.
Time to retire the old bulbs!
.
__________________
Da Chicago So Side; The Village of Park Forest, IL; 3/7 Cav, 3rd Inf Div, Schweinfurt, Ger 65-66; MACV J12 Saigon 66-67; San Leandro, Hayward & Union City, CA (San Francisco East Bay Area) GO DUBS ! (aka W's)
|