Cost saving comparator for low energy bulbs Enter your figures into the black boxes then press Recalculate

Standard bulb

Energy saving bulb

Saving

Life of bulb

hours

hours

times longer life

Power of bulb

watts

watts

less watts used

Cost of bulb

£'s

£'s

£'s saving(in bulbs) over life of bulb

Power used(over the life of the low energy bulb)

Kw hours

Kw hours

Kw hours saved over life of energy saver bulb

Bulb use

hours per day

Unit cost of electricity

(Kw hour)

£'s

Cost saving in year one

one(taking the more expensive bulb cost into account)

£'s (if it's minus that's a loss)

CO2 saving in year one

Kg. of CO2

Pay back (time based on extra cost of bulb minus electricity saving)

time(based on the extra cost of low energy bulb minus saving in electricity)

Days

CO2 saving at point of pay back time

Kg. Of CO2

Combined cost saving of bulb and electricity over life of low energy bulb

(over the life time of the low energy bulb)

£'s

CO2 saving over the life of the low energy bulb

Kg. of CO2