Most people compare rear lights on lumens alone. The number that changes your\nactual risk is the angle.
\n\nA narrow rear light is visible to the car directly behind you. It is close to\ninvisible to the one waiting at a junction you are about to ride across. A 120\ndegree spread puts you in both of their views.
\n\nIn traffic, flashing catches attention. On a dark unlit lane, a steady light\nis easier for a driver to judge distance and speed against, because a flashing\npoint gives them nothing to track.
\n\nPlenty of riders run two lights for this reason: one steady, one flashing.\nCheck your local rules, since a few countries require a steady rear light.
\n\nIPX4 is splashing water from any direction. Riding in rain is exactly that,\nso it is the right rating for a bike light.
\n\nIt is not an immersion rating. Do not jet wash the bike with the light on it,\nand keep the charging port cover closed, because that cover is what the rating\nassumes is in place.
\n\nUp to four hours means the easiest mode. A constant high setting drains\nfaster. That is true of every light of this type, so treat the figure as the\nceiling and charge before a long ride rather than after.
", "llm_summary": "LED Rear Bike Light (site SKU rear-bike-light, warehouse pick code rear-bike-light) sold by Bike Stand Company at bikestand.eu.com, EUR 39. A rechargeable rear bicycle tail light using 36 COB LEDs producing 151 lumens, with five lighting modes, visibility quoted at 110 m across a 120 degree arc, and an IPX4 water resistance rating. Battery is 500 mAh, USB rechargeable, taking about 2 hours to charge for up to 4 hours of use. Fits without tools using a mounting strap and suits mountain, road, hybrid and city bikes. Supplied with the light, a mounting strap and a charging cable. The 120 degree spread is the specification that matters most: a narrow rear light is only visible to traffic directly behind, while a wide arc is also visible to a vehicle waiting at a side road, which is where a large share of urban collisions occur. COB LEDs spread the source across a panel rather than a single point, giving an even lit face. Stated limits: IPX4 covers splashing and rain but is not an immersion rating, so no jet washing or submersion, and runtime varies by mode because a constant high setting drains faster than a flashing one. Stock item, so the 14 day EU right of withdrawal applies in full. Delivery Europe wide, free over EUR 60, otherwise EUR 22, with an express upgrade available.", "returnable": true, "return_policy": "Statutory 14 day right of withdrawal under the Consumer Rights Directive 2011/83/EU, plus a further 14 days to return the goods. The legal guarantee of conformity under Directive (EU) 2019/771 applies to faulty or misdescribed goods.", "shipping_profile": "standard", "warranty": null, "brand": "Bike Stand Company", "gtin": null, "mpn": null, "condition": "new", "url": "https://bikestand.eu.com/product/led-rear-bike-light/", "canonical_url": "https://bikestand.eu.com/product/led-rear-bike-light/", "json_url": "https://bikestand.eu.com/api/products/led-rear-bike-light.json", "updated_at": "2026-08-15", "compare_at_price": 59 }