Solar lights made for the street are a different animal from the little stake lights that come in packs of six. A street luminaire has to throw usable light across a carriageway width, hold it from dusk to dawn, and do it in December without anyone climbing a ladder. That is an engineering job, and the specification sheet is where it is won or lost.
All-in-one heads carry panel, battery, driver and LED in a single housing that clamps to a 60 mm bracket or pole top. They are quick to fit and there is no wiring at all, but the panel sits wherever the pole sits — so the pole has to stand in the sun. Split-panel units put the photovoltaic module on a separate adjustable arm or a nearby roof, which is what you want on a tree-lined lane. Solar posts and bollards, such as the Lutec Flair and London ranges or the SU-MA ARMA post, are the domestic end of the same idea: lower output, but a fitting that looks like it belongs on a driveway rather than a bypass.
Lithium iron phosphate cells have taken over the serious end of this category, and V-TAC's LiFePO4 street heads are typical of the shift. The reason is not capacity — it is cycle life and temperature. A LiFePO4 pack tolerates several thousand charge cycles where a standard lithium-ion pack manages a few hundred, and it holds its voltage far better in the cold. Neither chemistry likes being charged below freezing, which is why good units carry a low-temperature cut-off in the controller.
Ask for autonomy in days, not hours. A unit rated for three to five days of autonomy will ride out a run of grey weather; one sized exactly to a single night will go dark on the second overcast day in November.
A serviceable rule of thumb is spacing of three to four times the mounting height. Push the poles further apart and you get pools of light with black gaps between them, which reads as worse lighting than a lower, evener level.
Most solar street heads run a two-stage profile: roughly 20–30 % output all night, stepping to full for 15 to 60 seconds when the PIR detects movement. That single feature is what makes dusk-to-dawn operation possible on a battery that has to survive a short winter day. Colour temperature is usually 4000 K or 6000 K here; 6000 K reads as brighter and is conventional for traffic routes, while 4000 K is easier to live beside if there are windows nearby.
It wins wherever a cable run is the expensive part: an access road with no supply, a farm yard, a car park at the far end of a site, a lane where digging a trench costs more than the lanterns. It is a poor choice where deep shade, a north-facing valley or overhanging trees keep the panel dark, and it is not a substitute for a designed, standards-compliant installation on an adopted public highway — that remains a mains job with photometric calculations behind it.
On an unlit private road, almost always: there is no cable, no trenching and no running cost. On a site with power already at the pole base, the sums are much closer.
The LED module typically outlives everything else. Plan on replacing a LiFePO4 pack somewhere around the eight-to-ten-year mark, and check before buying that the battery can be replaced at all.
A panel tilted 30–45° usually sheds snow on its own once the sun hits it. Flat-mounted panels do not, which is one more argument for an adjustable bracket.
Not from an all-in-one head. Use a split-panel model and put the module in the open.
For the softer, decorative end of the same technology, see what suits a balcony.
