How many watts / amps for LED light bar?

[LD1]

This has somewhat to do with the spectral response characteristics of human eyes and the Purkinje Effect and the shift from photopic vision to scotopic vision, or the color sensitivity of eyes shifting towards blue under low light conditions. What this means is a greater sensitivity to contrast differences. Human evolution for seeing better at night under moonlight.

That seems to make sense.

Outdoor dusk-dawn lights (we call them security lights).....most of which are owned and managed by the electric company.....are(were) mostly available in 2 flavors. HPS and mercury vapor.

The 100w HPS bulbs were typically 8000-10000 lumens.
The MV 175w were only about 8000 lumens or less. But they "seemed" brighter and could see farther because the HPS bulbs even though emitting more "lumens", but at a color temp of ~2000k.......they just appear to no emit as much light and make it harder to see IMO

 

[swines]

The three types of lamps most prevalent today for street lighting are all high-intensity discharge (HID) type lamps. The three are mercury vapor, high-pressure sodium (HPS), and metal halide.

Mercury vapor lamps have a green/blue output and although the color temperature measures 5600 - 6400 Kelvin (K) it is not a continuous spectrum and has a very low color rendering index (CRI) of 15-50 (depending upon the exact lamp type). Mercury vapor efficiency is 35-65 lumens per Watt.

Color rendering index is a comparison to 5500-degree Kelvin daylight which is given a CRI of 100.

Metal halide lamps use a variety of halides with most having a color temperature above 3400. Some lamps are mixed spectrum and can appear almost white to the human eye. They are more efficient than mercury vapor lamps but not as efficient as HPS. Metal halide lamps have a range of color temperatures from as low as 2,000 Kelvin to as high as 20,000 Kelvin. The color rendering index can be very good with a range from 60-90. Metal halide efficiency is 50-115 lumens per Watt.

High-pressure sodium has a very low color temperature of 1900 - 2100 degrees Kelvin and is not a continuous spectrum. They have a color rendering index of about 20-65 depending upon the lamp type and manufacturer. The lamps cost less to run and last longer than mercury vapor or metal halide. To the human eye, the color ranges from orange-brown to nearly white with the newer "color improved" lamps. High-pressure sodium efficiency is 70-140 lumens per Watt.

Another advantage to HPS lamps is the light output degrades less over the life of the lamp. Most street lighting today is HPS because of lumen output, lamp longevity, and efficiency. LED street lights are becoming available but they still do not have the lumen output of HPS or metal halide. They are competitive with mercury vapor lamps for light output but not price. The CRI of LEDs is in a range of 80-95, meaning colors are rendered much better with LED street lights.

 

[Mtnmnstr]

I'm ready to mount light on my tractor. Where are you finding the best location with the least amount of vibrations?

 

[subscribeljdz]

Hey. Any LED lighting device is much more energy efficient than halogen lights, which burn out in a few hours of full use. If you want to planer rye at night, you might be okay with a not so huge but handy LED flashlight of this type https://www.amazon.com/Vont-Flashlight-Flashlights-Water-Resistant-Accessories/dp/B089T8HDBV. To harvest rye or other plants, you can use the spotlight mode, which uses more energy but illuminates better. If you're dealing with a crop you've already harvested, switch to a different near-field light mode. I think you only need to know that this kind of light has a lifespan of up to 20k hours. I think you don't need to go into the details of the power of such a bulb.

 

[scootr]

Initially I wanted to put a light bar on the front of the ROPS but I notice there is quite a bit of vibration going on there. So I considered mounting on the Rops vertical support. But I worry about having the lights behind my head maybe blind siding me?
Maybe a couple of supports to minimize the roof vibration is the best action?

 

[CobyRupert]

Did anybody answer OP’s question?

Running on battery there’s about 12.6 watts per amp (12.6Watts/amp)
With the engine running, there’s around 14 Watts/amp.


Next!

 

[droy]

A poster once mentioned the great quantity of bugs a ROPs mounted light bar attracted. That would be a concern if I ever considered them. Any others with that issue?

After Hurricane Laura dropped the tractor shed onto the roof of my cabbed L4740, I repaired / modified the roof, replacing the damaged lights with a 30” Superbright light bar. All the light I need for nighttime pasture mowing. Don’t remember the lumens or amps but it’s the double row Super Series combo (spot with flood diodes on each end). Used one of the original leads to furnish power and no problems as of yet…….except for bugs! Sitting in the cab they don’t harass me physically but are a distraction especially after a recent bad wasp nest experience. I’m still jumpy when flying insects are near me.
While the lightbar does provide some side light, if I were to do it over would probably try one of the curved combo light bars, or a shorter 20” (?) one with a smaller pod on each end that could be individually aimed for more side light. The straight combo light is not really lacking, but as my wife often says “some people are NEVER satisfied”…….Still trying to figure out who she is talking about.