I notice with some interest that some local authorities are spending large amounts of money "upgrading" lighting in their housing stock/amenities etc by replacing existing twin 8w luminaires with single-lamp 28w or 38w 2D models.
My question is simply "why?" given the following facts regarding the two lamp types:
a) The standard twin 8W fitting and 2D fitting BOTH employ magnetic switchstart control gear (in 9/10 surveyed boroughs)
b) The twin 8W luminaire takes a load of 28W including two ballasts - 22W with a shared ballast. This compares with 28W minimum lamp load PLUS ballast losses in the 2D equivalent. In each installation I have surveyed, the lighting load has increased.
c) The 8W models could have been cheaply upgraded with electronic starters replacing glow switch types. As lamp and starter are replaced in all switch start circuits, the maintenance cost is reduced.
The cost of a 2D lamp alone is four times the price of a pair of 8W tubes.
2D has more disadv
2007-03-06 13:45:05 · 2 answers · asked by LEE N 1 in Social Science ➔ Economics
Perhaps it has to do with efficiency. The newer technology has allowed it to become slightly more efficient, getting more output for the same inputs. Older style fluorescent lamps may let some of the energy leak, radiating as something other than light.
Don't know for sure, this is purely speculative. Just thought you deserved a better answer than you got.
2007-03-09 02:57:57 · answer #1 · answered by theeconomicsguy 5 · 0⤊ 0⤋
what a boring question
2007-03-06 22:29:50 · answer #2 · answered by properwired 3 · 0⤊ 1⤋