Lighting Maintenance

Vedhas offer a simple, low cost solution for your lighting maintenance. Our qualified engineers will visit each of your sites on a regular basis to check your lighting

Whilst there, they will change only the lamps and fittings that have failed. Therefore light levels in each site will be kept to the high standard you require. There is no binding contact for you to sign. We will visit each site regularly whether there is work to do or not.

For this service there will be no upfront contract fees, no call out charges and no charge for labour. You will only pay for parts installed at the prices on our agreed price list. Our customers retain control of costs at all times and can set individual limits per site. There is even more control because the site manager will be required to sign off any work undertaken using our engineers forms.

With no contract or upfront contract fee it is our responsibility to ensure that each of your scheduled service visits is met, we only earn money if we attend each visit promptly and do our work efficiently. Our aim is to remove the pain from your lighting maintenance. No hidden charges, no contract and you maintain your staff's safety.

Frequently Asked Questions

How does a compact fluorescent light bulb work?
Fluorescent light bulbs this includes compact fluorescent are more energy efficient than regular bulbs because of how they produce light. Regular bulbs create light by heating a filament inside the bulb; the heat makes the filament white-hot, producing the light that you see. A lot of the energy used to create the heat that lights an incandescent bulb is wasted, which make it less efficient the fluorescent bulbs. A fluorescent bulb, on the other hand, contains a gas that produces invisible ultraviolet light when the gas is excited by electricity. The ultraviolet light hits the white coating inside the fluorescent bulb and the coating changes it into light you can see. With fluorescent bulbs heat is not required to create light, they are far more energy efficient than regular bulbs. By regular bulbs we mean incandescent bulbs.

What's the difference between a compact fluorescent light bulb and a fluorescent bulb?
The primary difference is size; compact fluorescent bulbs are made in special shapes to fit in standard household light sockets, like table lamps and ceiling fixtures. Also most compact fluorescent lamps have”integral" ballast that is built into the light bulb, whereas most fluorescent tubes require a separate ballast independent of the bulb. Both types are energy efficient.

What compact fluorescent light bulb do I buy to replace regular incandescent bulb?
While a regular light bulb uses heat to produce light, a fluorescent bulb creates light using an entirely different method that is far more energy efficient - in fact, 4-6 times more efficient. This means that you can buy a 15-watt compact fluorescent bulb that produces the same amount of light as a 60-watt regular incandescent bulb. On most packages for fluorescent bulbs it will state what it is a regular bulbs replacement in watts. Just look for the wattage you would normally buy in a regular bulb.

Here are the watts needed by regular incandescent bulbs and compact fluorescent bulbs to produce the same amount of light.

Because the wattage of a CFL bulb is much lower than that of an incandescent, you can use higher wattage CFL giving you the equivalent light of a higher wattage incandescent. For example: If your fixture says not to exceed 60 watts, you can use a 15 watt CFL to get the same amount of light as an incandescent bulb or use up to a 42 watt CFL and increase the amount of light.

Can I use a compact fluorescent light bulb with a dimmer switch?
To use a compact fluorescent bulb on a dimmer switch, you must buy a bulb that's specifically made to work with dimmers. Also some dimmers are designed to work with fluorescent bulbs. We don't recommend using regular compact fluorescent bulbs with regular dimming switches, since this can shorten bulb life and could damage the dimmer.

Why does my compact fluorescent light bulb flicker or appear dim when I first turn it on?
The first generation of compact fluorescent bulbs flickered when they were turned on because it took a few seconds for the ballast to produce enough electricity to excite the gas inside the bulb. There are some products available where flicker time has been shortened to 1 second.

Can I use a CFL in applications where I will be turning the lights on/off frequently?
Yes you can but compact fluorescent light bulbs work to their best if they are left on for over 15 minutes each time they are turned on. They can take up to 5 minutes to warm-up. Frequently switching them on and off will shorten the life of the product significantly, you will not reap the financial benefits because you will be replacing them on a more frequent basis.

Can I use a compact fluorescent light bulb in an enclosed light fixture?
Compact fluorescent light bulbs may generally be used in enclosed fixtures as long as the enclosed fixture is not recessed. We would recommend you ask the wholesaler, store you’re purchasing from or the manufactures before doing anything.

Can I use a CFL bulb outside?
Many CFL bulbs can be used outdoors if used in an enclosed fixture. To be certain ask the wholesaler or store because the fitting has to be to a certain IP rating.

Should I be concerned about using CFLs in my home or should I take any special precautions?
CFLs are safe to use in your home. However, CFLs are made of glass tubing which can break if dropped or roughly handled. Be very careful when removing the lamp from its packaging, installing it, or replacing it. Always screw and unscrew the lamp by its base and never forcefully twist the CFL into a light socket by its tubes.

I have heard CFLs can overheat and smoke, is this true?
A lot of CFLs reach the end of useful life and fail passively. In some cases, electronic components in the ballast power supply may fail may result in some smoke, odor, or discoloration (browning) of the plastic housing. The failure of some electrical components can result in an audible "sizzling" or "popping" sound. But remember if your CFLs and fittings are to BS standards you should be fine.

What do I do with a CFL when it burns out? What is the proper disposal of a CFL bulb?
Follow these guidelines to dispose your CFL properly:

> Like batteries, thermostats, and other hazardous household items, CFLs should be disposed of properly. Do not throw CFLs away in your household garbage if better disposal options exist. Just drop it off to our office and we will dispose of it correctly as the CFLs are not broken.

What should I do if a CFL breaks?
There is such a small amount of mercury in CFLs; your greatest risk if a bulb breaks is getting cut from glass shards. Research tells us that there is no immediate health risk to anyone should a bulb break and it's cleaned up properly.

BS5266
The British Standard for emergency lighting, it has now been revised to conform with the European Standard EN1838. It is now issued in the UK under the reference BS EN 1838/BS5266 Part 1/7/8

BS EN60598-2-22:1999
This is British/European luminaire product standard.

CANDELA (CD)
The unit of luminous intensity.

CENTRAL BATTERY SYSTEM
is a system where the batteries for a number of fittings are housed in one location, usually for all of the fittings in one subcircuit.

CENTRAL TEST
A testing system for a wide range of applications operating on 24v, 50v or 110v as well as 230v AC Static Invertor projects.

COLOUR RENDERING INDEX (CRI)
A measure of the degree to which the appearance of a surface colour under a given light source compares to the same surface under a CIE reference source. The index has a maximum value of 100.COLOUR TEMPERATURE (°K)
All materials emit light when heated (e.g. metal glows red through to white as the temperature increase). The temperature to which a full radiator (or ‘black body') would be heated to achieve the same chromaticity (colour quality) of the light source being considered, defines the correlated colour temperature of the lamp, quoted in degrees Kelvin.

COMBINED EMERGENCY FITTING (SUSTAINED)
is a light fitting containing two or more lamps at least one of which is energised from the emergency supply, the remaining lamps are supplied from the normal supply.

CONVERSION KIT
A product used to provide standard mains luminaries - including low voltage - with an emergency back up should the mains power fail.

DESIGN VOLTAGE
The voltage declared by the manufacturer to which all the ballast characteristics are related.

DISABILITY GLARE
Glare produced directly or by reflection, that obscures or impairs vision of an object, but does not necessarily cause any discomfort.

DISCOMFORT GLARE
Glare which causes visual discomfort.

DOWNWARD LIGHT OUTPUT RATIO (DLOR)
The ratio of luminaire light output below the horizontal, compared with total lamp light output.

EMERGENCY EXIT
is a way out intended to be used at any time. Final Exit is the terminal point of an escape route at which persons are no longer in danger from any hazard requiring evacuation of the building.

EMERGENCY LIGHTING
is the lighting provided for use when the normal lighting mains supply fails, or when local sub circuit failure occurs.

ESCAPE ROUTE LIGHTING
is provided to ensure the means of escape can be effectively identified and used.

EXTERNALLY ILLUMINATED SAFETY SIGN
A sign that is illuminated, when it is required, by an external source within 2m.

F ' MARK
Shows the luminaire can be mounted on flammable surfaces.

FINAL EXIT
The terminal point of an escape route, beyond which point persons are no longer in danger from fire or any other hazard requiring evacuation of the building.

GLARE
The discomfort or disability that occurs when there is an excessive change of luminance in the field of vision.

HIGH RISK AREA LIGHTING
The part of escape route lighting provided at a potentially dangerous location to enable proper shutdown procedures for the safety of the operator and other occupants of the building.

HOUSING 850ºC TEST
Mandatory test for emergency luminaires used on escape routes, to establish that materials do not burn at given temperature. Self-extinguishing grades of plastic must be used, or alternatively glass and/or steel.

ICEL 1001 REGISTRATION
The industry standard for the approval of photometric performance and claimed data of emergency lighting equipment, which is tested by the British Standards Institute.

ICEL 1004
The industry standard and accepted practice for the conversion of mains luminaries to having an emergency battery powered back up.

ILLUMINANCE (LUX)
The luminous flux density at a surface, indicated in lm/m2.

INGRESS PROTECTION (IP) NUMBER
Classification of the degree of protection a luminaire provides against the entry of solid foreign bodies and moisture.

INTERNALLY ILLUMINATED SAFETY SIGN
A sign that is illuminated, when it is required, by an internal source.

ISOLUX DIAGRAM
Diagram showing contours of equal illuminance.

K FACTOR
The ratio between the light output from the lamp in the worst condition, normally at end of discharge and with cable volt drop, to the light output at nominal voltage.

LAMP LUMEN MAINTENANCE FACTOR (LLMF)
The proportion of light output of a lamp after a stated period, compared with initial lumen output.

LAMP SURVIVAL FACTOR (LSF)
The proportion of functioning lamps in an installation after a stated period.

LIGHT LOSS FACTOR (LLF)
See Maintenance Factor.

LIGHT OUTPUT RATIO (LOR)
The ratio of the total light output of a luminaire, compared with total lamp light output.

LUMEN (LM)
The unit of luminous flux used to describe the quantity of light emitted by a source or received by a surface.

LUMINAIRE
Apparatus which distribute the light given by a lamp or lamps, including all the items necessary for fixing and protecting the lamps and for connecting them to the electrical supply.

LUMINAIRE MAINTENANCE FACTOR (LMF)
The proportion of light output from a luminaire with dirt deposition after a stated period, compared with the initial light output when clean.

LUMINANCE (CD/M2)
The perceived brightness of a surface, measured by the intensity of light emitted or reflected from a surface area in a given direction.

LUMINOUS EFFICACY (LM/W)
The ratio of light emitted, to the power consumed by a lamp.

LUMINOUS FLUX (LM)
The total light emitted by a lamp, measured in lumens.

LUMINOUS INTENSITY (CD)
The power of a light source or illuminated surface to emit light in a given direction, measured in candela.

LUX
The unit if illuminance, equal to one lumen per square metre (lm/m2).

MAINTAINED EMERGENCY LIGHTING
is a light fitting containing one or more lamps all of which operate from both the normal and emergency supply at all times.

MAINTENANCE FACTOR (MF)
The ratio of the illuminance provided by an installation at a stated period, compared to the installation when new. Calculated as a product of lamp lumen, lamp survival, luminaire and room surface maintenance factors.

MOUNTING HEIGHT
is the vertical distance between the light fitting and the floor.

NON-MAINTAINED EMERGENCY LIGHTING
is a light fitting containing one or more lamps all of which operate from the emergency supply only following the failure of the mains supply or local sub circuit.

NORMAL LIGHTING
is all permanently installed artificial lighting operating from the mains supply for use when inadequate lighting is available during occupation of the building.

RATED DURATION
is the manufacturer's declared duration for a battery operated emergency light. Typically one to three hours when fully charged.

RATED LOAD
The maximum load which may be connected to the system which will be supplied for the rated duration.

RE-CHARGE PERIOD
The time taken for the batteries to regain sufficient capacity to achieve their rated duration.

ROOM INDEX (K)
Index defining the relationship between the height, length and width of a room. Used for illuminance calculations.

ROOM SURFACE MAINTENANCE FACTOR (RSMF)
The proportion of illuminance provided by a lighting installation with dirt deposition on the room surfaces after a stated period, compared with the illuminance when the room was clean.

SAFETY SIGN
A sign which gives a general safety message, obtained by a combination of colour and geometric shape and which, by the addition of a graphic symbol or text, gives a particular safety message (ISO 3864: 1984).

SELF CONTAINED EMERGENCY LIGHT FITTING
is a fitting or sign providing maintained, nonmaintained or combined emergency lighting in which all of the operating components are within 1 meter of the housing.

SELF TEST
A testing system for a wide range of self contained luminaries.

SLAVE FITTING
is an emergency light fitting without it's own batteries that is designed to work within a central battery system.

SPACING TO HEIGHT RATIO (SHR)
The ratio of the distance between luminaire centres in relation to their height above the working plane. Maximum spacing to height ratio (SHRmax) is the maximum spacing of an array of luminaires that will achieve a ratio of min/max direct illuminance of at least 0.7.

STANDBY LIGHTING
That part of emergency lighting provided to enable normal activities to continue substantially unchanged (IEC 50 - Chapter 845).

STATIC INVERTOR
A central system which enables mains luminaries to be utilised as emergency fittings without the need for additional wiring.

SUSTAINED EMERGENCY LIGHTING
See combined emergency lighting.

UNIFORMITY RATIO
The ratio between maximum to minimum illuminance measured at the working plane.

UTILISATION FACTOR AT ZERO REFLECTANCE (U.F.O.)
Determines the proportion of light output from a lamp that falls directly on the floor for different room indexes and types of diffuser.

UNINTERRUPTIBLE POWER SUPPLY (UPS)
A versatile method of providing back up power and or steady, constant mains supply to specific applications such as I.T & telephones as well as being used to provide an emergency lighting facility in certain installations.

UPWARD LIGHT OUTPUT RATIO (ULOR)
The ratio of luminaire light output above the horizontal, compared with total lamp light output.

UTILANCE (U)
The proportion of luminous flux emitted by a luminaire which reaches the working plane.

UTILISATION FACTOR (UF)
The proportion of luminous flux emitted by a lamp (or lamps) which reaches the working plane.

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Testimonials

Service Engineers were very smart,
clean and they were very efficient,
caring and helpful. I was pleased
with your company.”
Victor Sorescu - Stevenage

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Vedhas attended my property within only a few hours of making a call to them and had my electrics up and running in no time. I would highly recommend them, especially if you need an electrician, plumber or boiler repair engineer.
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