The Sag: Why Your Hedge Net Lights Go Dark in the Top Corner (and the Re-Tension Fix)

Every year I get the same complaint about hedge net lights: the bottom runs fine, the middle runs fine, and the top corner just... stops. Not the whole net. One section. The one nearest the tautest corner.

I used to write it off as a bad net. It isn't. It's geometry, and it happens to a lot of perfectly good strings because of the way you install them.

The problem nobody photographs

You buy a 3 x 2 m net, staple it to a hedge, and it looks great for two weeks. Then gravity does its thing. The clear polyethylene netting stretches. The staples that were flush start to pull. The whole sheet droops by maybe four or five centimetres, and you honestly don't notice, because it still hangs on the plant.

That droop is the whole story. Here is what actually breaks:

1. The sag puts a low point in the net. Rain and condensation stop draining off the wire and start pooling in that low point. The IP65 rating on the individual LEDs holds up fine. The rating you actually need is on the connector, and the connector is a small moulded joint that was designed to sit dry. Now it sits in a puddle that never empties.

2. The taut corner is where the string is pulled the hardest. In our factory runs we pull-test the end-to-end leads well past what a hedge needs, but the joint that takes the most flex over a winter, the one right by your staple point, is where the copper inside a clear wire finally gives up. Flex, plus the pooled water above, plus the cold of a December morning, is what kills the top corner first.

I have watched this fail on a string that had zero bad LEDs. Every single diode lit on the bench. The net still died in the top corner. Because the wire was flexing against a branch it should not have been touching.

The fix is tension, not replacement

Here is the part most installers never do: re-tension the net every season, not once. When you re-staple it this year, do three things in order.

First, staple so the net sits about one to two centimetres off the foliage, not crushed against it. The gap lets water drain off the wire instead of wicking along the plant's surface straight into the joints. A net that hugs the hedge is a net that drinks.

Second, run the power leads the long way. People start the plug at the top and drop the cable down, which drags the whole sheet and loads the top corner. Start the lead low, let the net hang, and the heavy corner stays slack where it can move. A slack joint survives a winter. A loaded one does not.

Third, check the one joint you suspect. The top-corner connector. If it has flexed white or you can see a hairline at the seal, that is your dead section. Replace or re-seal that single joint and the net comes back. You do not need a new 15-metre net for one failed connector.

What to actually buy for this

If your hedge is in the rain, buy a net where the lead-in and every in-line joint is the same IP65 spec as the bulbs, not just the diodes. Check the connector, not the light. And if you are running more than one net, wire them so each net has its own lead to the supply, so one sagging corner on one net does not take down the row. That is the difference between one dark corner and a dead hedge, and it comes down to how the nets are wired, not how many LEDs they have.

The same logic is why we spec flameless candles for the table under the hedge: the one thing a real flame on a damp, wind-swept terrace will not survive is the exact breeze that also loosens your netting. Pick the one light that keeps its rating when things get slack.