I need to replace 10 halogen floodlights that are from 100-300W, and I would love to use LED, but I don’t want to break the bank. Does anyone have any ideas as to how this could work? I apologize if this is the wrong forum, Led light bulbs looked like the right place to post.
I don’t think that’s reasonable unless cost is not a factor. 300W halogen is a LOT of lumens. Anyhow, that should be putting out about 6000 lumens. That makes this a problem I’ve looked at recently. A quick guesstimate showed little difference in cost between using a 12V power supply to achieve 6000 lumens with either MT-G2 or XM-L2.
This power supply should provide suitable output when running a pair of MT-G2’s in series in direct drive…no driver. You’ll need a sizable heat sink and some cooling. Splicing in a 12V CPU fan in parallel on top of a CPU cooler would probably be the way to go.
I forget if that should produce 6000 or 8000 lumens, but I think it was the latter. In my case, I decided buying a pair of the 3700 lumen LED shop lights from Razorlux was a better way to go since output and cost would be close, and I wouldn’t have to fiddle around with making an appropriate fixture that wasn’t a very high risk fire hazard if I bought the Razorlux light.
Keep in mind that you need to make sure to avoid “watt equivalent” issues. In other words, a 300 Watt LED is not gonna be 300 actual Watts, but a Watt-equivalent (i.e. 45ish actual watts). Try to look for Lumen values.
Even with power LEDs, your results will be disappointing unless you match lumens. Halogens can crank out a ton of lumens in minimal space. You wont get that with LEDs, so expect to add several LED-based lights for every 1 halogen you replace.
If your lights are tied to a motion sensor, just leave it alone. You wont save any money. If they are on all the time, then yeah…consider LED… or the rare Florescent(sic) fixture.
How many lumens do I need to replace a 300 watt light bulb?
It depends on the type of bulb, and for filament bulbs the temperature of the filament. Different bulbs have always varied in brightness for a given wattage, mainly because their efficiency varies. The hotter the filament then the more efficient the bulb and therefore the brighter it is. However in general hotter filaments evaporate faster and so don’t last as long.
At one end of the scale you get the long life standard incandescent bulbs, say 5000 hours. 5000 hour bulbs run at a relatively cool filament temperature to achieve this life.
LED light bulbs and fixtures equivalent in lumens or light output to a 300 watt incandescent light are available in a variety of lumens outputs ranging from 2600 up to 4500, with a variety of color options from 2700K (Kelvin), a warm white color comparable to an incandescent bulb, and up to 5500K, a very white light. Must of the LED bulbs and fixtures of this output average around 50 to 55 watts of consumption.