Converting halogen floodlight to LED

JustAnotherSaver

My mother was interested in switching out her halogen floodlight for an LED one but not sure what wattage to look for to get an 'equivalent' if you get me? Her front garden is quite large and there's no neighbours in case that matters.


https://www.ledhut.co.uk/led-garden-outdoor-lights/flood-lights.html


Hopefully nothing north of 50w as beyond that the prices just seem to skyrocket.



The unit she currently has installed: https://www.amazon.co.uk/gp/product/B001XPCXNI/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1




While i'm here asking, i may as well also ask - would you opt for warm or cool white and why (looking to see if there's any benefits / disadvantages of either)?

casper_g

She has a 400W halogen floodlight. The 50W LED light says it is a suitable replacement for a 180W halogen, so on that basis you'd want a 100 to 150W LED bulb.

That said, what does she actually need the light for? Is the 400W halogen the minimum she needs, or massive overkill? Maybe a 50W LED would actually be fine....

casper_g

400W B lbs seem to mostly be rated as having outputs of about 8500 to 9000 lumens, so choose on that basis if you want a similar amount of light.

troffasky

JustAnotherSaver wrote: »

While i'm here asking, i may as well also ask - would you opt for warm or cool white and why (looking to see if there's any benefits / disadvantages of either)?

Personally I prefer cool white for everything.


For LEDs, cool is more efficient than warm:


https://www.quora.com/Are-warm-colored-lights-more-energy-efficient-than-cooler-colored-lights

Rodders53

You are going to need a high wattage LED to get the same lumens out as a 400 W linear halogen. 90-100 Watts.

How large is 'quite large'. I've fitted a 20W led floodlight about 4m high to illuminate an area approx 15m x 15m adequately (in my view). Mine is 3000K as I prefer the warmer white look, personally.

The eye is actually more sensitive in the warm whites areas. Blue-cold-white light is not ideal as our blue receptors are fewer.

JustAnotherSaver

Rodders53 wrote: »

You are going to need a high wattage LED to get the same lumens out as a 400 W linear halogen. 90-100 Watts.

How large is 'quite large'. I've fitted a 20W led floodlight about 4m high to illuminate an area approx 15m x 15m adequately (in my view). Mine is 3000K as I prefer the warmer white look, personally.

The eye is actually more sensitive in the warm whites areas. Blue-cold-white light is not ideal as our blue receptors are fewer.

I'd say it's wider than your area but probably slightly shorter at a guess. Actually it might be about 15m long thereabouts but the width of the garden, and i'm guessing again, could be 20-30mtrs.


Any idea why the Amazon link says 400W PIR yet elsewhere in that link it says wattage = 500 watts? The model number is SLW500 yet part number is SLW400?




I prefer the warm white for indoor lighting. All our house bulbs are LEDs, all warm white. My wife hates the cool white, but i was wondering about cool white for the outside and whether it'd be any better or not.


I was paying more attention to my mother's floodlight as i was there this morning and it actually lights the garden up quite well. Not sure what an LED equivalent unit would offer her over the halogen tbh.

chrisw

JustAnotherSaver wrote: »

Any idea why the Amazon link says 400W PIR yet elsewhere in that link it says wattage = 500 watts? The model number is SLW500 yet part number is SLW400?

I think the lights were all originally 500W, but around the time they got rid of 100W standard bulbs and introduced standard halogen energy saving bulbs, they introduced a halogen 400W bulb which has a similar light output to the 500W but uses less energy.

So I suspect it's a historical naming issue.

ic

I replaced 150W halogens with 10W LED. A single 500W halogen was replaced with two 10W. The resulting coverage is far superior. A 100W LED sounds excessive to me, the sort of thing you'd want to cover a car park!

Make sure the lights are mounted high up so that they can face downwards, so that they're light is directed to what you want to cover. Installing low (below 10 ft in height) and pointing sideways with half the light going up into the sky is pointless and a nuisance to your neighbours and passing traffic.

Jonesya

Depends what its being used for, but 50W LED provides a reasonable light. The ones in your link looked a bit expensive - something like this for £35

https://cpc.farnell.com/ledvance/4058075814714/floodlight-led-50w-3000k-sensor/dp/LA0746003?CMP=CPC-ebooks-NovemberDeals18

JustAnotherSaver

Yeah i've looked at other units and LED Hut seemed quite expensive.



As for height it'd be just above the bedroom windows of a house (no, not a bungalow) so whatever height you'd expect that to be. All i know is it's too high for me to be comfortable at