A.Light bulbs emit little or no ultraviolet radiation. Their light spans the visible spectrum, but most energy is given off as heat in the near-infrared.
Q.How bright is a 60 watt bulb
A.A standard 60 watt bulb is the equivalent of around 72 candlepower, or candela (cd) as it is now known. The new term was defined in 1979.
Q.If i left 3 40 watt light bulbs on in my house for ten hours how much would it cost. I'm on british gas electric and live in medway.
A.At the British Gas standard rate of 24.173p per kWh, your 3 40w bulbs will use 1.2kWh costing 29p. This can be reduced by duel fuel discounts.
Q.How long will a standard fully charged car battery last for if powering a 60w light bulb?
A.An average car battery has 12,000 watt-hours on a full charge. Therefore, it could power a 60 watt light bulb for 200 hours before being fully drained.