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This section describes portable lighting which shall be used for compliance with the Standard Specification Section 105-14 Night Work requirement for artificial lighting.
All lighting equipment will be furnished as required and retained by the Contractor after the work is completed. Material and/or equipment is not required to be new but shall be in good operating condition and in compliance with applicable safety and design codes.
The Contractor shall submit, for the Engineer's review and approval, a lighting plan showing the type and location of lights he proposes to use for night work. The plan shall be presented on standard size roadway plan sheets (22" x 36") and on a scale of either 100' or 50' to the inch. It shall clearly show the location of all lights necessary for every aspect of work to be done at night. In addition to the plan sheets, the Contractor shall submit catalog cuts giving the specific brand names, model numbers and ratings of the lighting equipment. The submittals shall include power ratings and photometric data. The Contractor shall allow 40 days for the Engineer to review the submittals. Night work shall not begin without the Engineer's approval of a lighting plan and the indicated lighting equipment and/or materials being in operation.
A tower light shall consist of mercury vapor, metal halide, high pressure sodium or low pressure sodium fixtures mounted on a tower approximately 30' in height. The tower light fixtures shall be heavy duty flood, area, or roadway style with wide beam spread. Fixtures used for a tower light shall have an output of 50,000 lumens minimum, and the combined outputs of all fixtures on each tower light shall not exceed 460,000 lumens. The fixtures shall be weatherproof and supplied with attached waterproof power cord and plug. The tower shall be sturdy and free-standing without the aid of guy wires or bracing. The power supply shall be of sufficient capacity to operate the light(s) and shall be located for the shortest safe routing of cables to the fixtures. A tower light consisting of the combined fixture(s), tower and power supply is preferred.
Tower lights shall be of sufficient wattage and/or quantity to provide an average maintained horizontal illuminance greater than 20 footcandles over the work area.
The lights shall be aimed and positioned to not only illuminate the area for construction work, but to assist the motorist. There shall not be any disabling glare to the motorist. In no case should the main beam of the light be aimed higher than 60 above straight down. The lights should be set as far from traffic as practical and aimed in the direction of, or normal to, the traffic flow.
Machine lights shall be mercury vapor, metal halide, high pressure sodium or low pressure sodium conventional roadway enclosed fixtures mounted on supports attached to the construction machine at a height of approximately thirteen feet (13'). Each fixture used for machine lights shall have light output between 22,000 and 50,000 lumens. The power supply shall be of sufficient capacity to operate the light(s) and shall be securely mounted on the machine. Electrical grounding of generators to frames of machines on which they are mounted shall be done in conformance with the National Electrical Code (NEC).
The machine light fixtures shall be of sufficient wattage and/or quantity to provide an average maintained horizontal illuminance greater than 10 footcandles on the machine and the surrounding work area. Machine lights are in addition to conventional automotive type head lights which are necessary for maneuverability.
Tower lights may be used when the night work is confined to a fairly small area and is essentially a stationary operation.
Machine lights may be used when the night work is not confined to a small area and is essentially a continuous moving construction operation.
Tower lights may be provided in lieu of machine lights upon approval by the Engineer. Use of tower lights in lieu of machine lights will be considered when the number of machines, type of work, or need for inspection justify their use as decided by the Engineer.
The work area where traffic control devices are being set up or repositioned at night shall be illuminated.
The work areas to be illuminated are the areas where construction equipment and labor are in operation and may be different from the work areas shown in the plans.
The illuminated work area shall be large enough so that the movements of all personnel and equipment engaged in the work will be contained in the area.
The Contractor shall provide sufficient fuel, spare lamps, generators, and personnel qualified to operate the lights to assure that they will be maintained in operation during night work.
Existing street lights shall not eliminate the requirement for the Contractor to provide lighting. Consideration may be given to the amount of illumination provided by existing lights in determining the wattage and/or quantity of lights to be provided, if noted in the Contractor's submitted lighting plan.
Payment for lighting provided by Tower and Machine Lights will be made only when a significant amount of night-time work is explicitly required and a pay item for portable lighting has been included in the contract. Otherwise, portable construction lighting will be considered incidental to other contract items and no direct payment will be made.
Payment for the lighting provided by tower and machine lights will be made at the contract lump sum price for "Portable Lighting". Partial payments for this pay item will be made as follows:
1. 50% of the lump sum price on the first partial payment estimate.
2. 25% of the lump sum price on the first partial payment estimate made after the project is 50% complete.
3. 25% of the lump sum price on the first partial payment estimate made after the project is 100% complete.
Such price and payment will be full compensation for all work of furnishing, operating and maintaining everything necessary to provide lighting.
Payment will be made under:
Portable Lighting Lump Sum