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I'm looking at the datasheets for these Philips SunStay streetlamps, which could be an option for lighting up dark areas in the town. One advantage is that an ESB Networks connection wouldn't be necessary, reducing installation costs. However, the luminaires can also be powered by mains electricity if desired. I haven't looked at the price, though. The entry-level model has the following specs:
- 2000 lumen output, 28/35 W solar panel
- 11 W LED output (with an efficiency of 175 lm/W)
- PIR sensor with a 5 metre range
- The streetlamps operate at 30% output throughout the night, ramping up to 100% when a pedestrian is detected
- A "ClearField" amber-red light recipe can be factory-configured for the LED module, producing a shorter-wavelength, lower colour temperature, amber-red output, making lights less disruptive to bats (see link below). However, efficiency is lower and typically 70 lm/W. I.e, lights appear dimmer
Solar irradiance is worst in December, with a worst-case scenario of 1 peak sun hour (PSH) per day in the north of the country to 2 PSH in the south, according to Met Éireann. For a 35 W panel, that's a potential storage of 35 watt-hours (Wh) of energy. When the 2000 lumen model is operating at 30% output, consumption is 30% x 11W = 3.3 Wh per hour. So a lamp wouldn't quite last a full night on a solar charge, but probably up to 10.5 hours.
Might be useful for the Valley park, the walkway between the AFC and GAA pitches, the Sunny Hill road from Cnoc na Gréine to the Newbridge Road etc.
Maybe worth trialling one?
Signify was formerly Philips Lighting, but became a spinoff and independent company in 2016.
This is the 2000 lumen model:
SunStay — All in one solar street light
Bat-friendly options:
A lighting solution — minimizing the night-time disturbance of bats
Met Éireann sunshine information:
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