400w metal halide v led?

Possibly not ... Look at the efficiency of MH compared to LEDs in Lumens per Watt. I believe they are a lot closer than 4:1

 

Personally I dont think LED has the throw of other types of lights, a metal halide will light something up 100 foot away.

 

A lot depend on the quailty of the led's use & the way the fitting is design to get the best output.

 

More so the reflector and optics.

 

Exactly.

You only need to look at Trinity House Lighthouse & their use of led lamps.
A complete redesign of the lense optics, has given some a longer beam range, & instead of 500-1500W traditional light source, it has been replaced with a 40-162W LED lamp.

http://www.sealite.com/products/lighthouse-equipment/high-output-led-light-source-series

http://sealite.s3.amazonaws.com/newweb/files/Lighthouse_Optics_iman.pdf

 

No. To get anywhere near a 400w MH you will be looking at a 240w LED floodlight at least.

 

LED lighting is strange for me. I have one of those rechargable site lights, bright as the sun if you shine it on something close up or look at it but go in a loft with it to do a JB and unless its pointing directly at the JB I cant see a thing, the shadows are horrendous. Go up with a 500W halogen and it would illuminate the whole loft.

 

maybe in warm white but with cool white skys the limit

 

Cool white leds = fridge - test street in my area used cool white led lanterns on the lamp posts. Turning off the son lit main drag into the test street was like driving into a fridge. Horrible blue tinged cold light.

 

I know what you mean, a lot of lamp posts near me have had cool white LED heads installed, it feels about 10 degrees colder when you turn into one of those roads, I'll bet the heating bills for the houses on those roads are higher than others. Cant imagine what its like when there is snow on the ground.

It reminds me of this bit of a ride in Disney called Test Track @ 2:11

 

Depends on the Cool White classing,some define 4000k as cool white, while others go as high as 6000k, go too high & you get the blue tinge effect.
And again it's all down to the quailty of the led's used.

 

Thanks Pete and Kiab.

 

No, a 100w LED in cool white will not meet a 400w MH. A MH is a white light so why would I bring warm white into the thread?

 

i know from personal findings that leds can surpass more than the figures state they should (as what the figures state should be dim can in use be suprising and bright) so just because the figures state it cant compare doesnt mean it wont in use)

 

I'm always amazed how much led lighting has improved in the led's,their lifespan & optics in just the last 5 years,& I wonder what advances we will see in another 5 years.
The other week I was was in a electrical wholesaler & got talking to a spark,(being nosey) he had collected some high bay led Philips GentleSpace gen2 fittings not into industrial electrics myself, but I was impressed with the fittings,they were even dimmable
& spark quoted a insane lifespan of up to 100,000 hours, which at time I thought was a made up figure, but looking at the spec sheet later, he was right, & Philips even offers various beam angle options for the fittings.

http://download.p4c.philips.com/lfb/f/fp-910925863180/fp-910925863180_pgl_en_aa_001.pdf

 

They maybe designed to meet those figures but I have seen some fail within weeks. Note they always say 'upto'.

Speaking of technological advances. Our wholesaler is now selling LED 'CFL' down lights cheaper that the traditional CFL ones.

 

Nothing is 100% perfect, your alway going to get some failures.

Doesn't surprise me LED 'CFL' down lights are cheaper that the traditional CFL ones.