The player home in the market district feels lit enough with the default furnishings, but is very dark when you switch them off and decorate yourself, especially under the staircase and upstairs. The craftable/placable light props (candles, torches, scones, etc) don't have a bright light-source attached to them either, so the space stays dark no matter how many of them you add.

By spawning in light-sources you can design the lighting in the room separate from the light props.

+ Less is more, too many different lights together can look broken...

+ Light-sources are permanent scene objects. This means they cannot be moved or removed, unless you reload to before you ever spawned them.
>> Technically you can reset a cell if you have it's ID... but I couldn't find this one so I couldn't try it.

+ I dunno if these light-sources are real-time or not, so watch your performance when you spawn them in and if it drops don't spawn in so many.

+ Adding more objects to a scene may result in longer loading times, but really, you don't need that many.

+ The FormIDs are NOT case-sensitive, don't worry about capitalising the letters. Pressing SHIFT in the console window sometimes enters cursor mode which stops you typing, to exit cursor mode hit ESC.

+ Make sure you have the prop selected that you want to add the light-source to.

1. Decorate the scene.
+ Place the light props and furniture as you want.

2. Make a hard save and back it up.
+ Documents>>My Games>>Enderal Special Edition>>Saves>>...
+ Copy the save file to somewhere safe.
+ If you want to go back to before you ever touched the lighting, this will be your save for that.

3. Make a quick-save (F5).
+ If you're unhappy with your light-source placement quick-load (F9) to go back to before you placed it and try again.

4. The process works like this:
a) Spawn a light-source at an existing object in the scene.
b) Does it look good?
+ Yes? Good, write that down.
+ No? (F9) Reload to before you added that light.
c) Repeat until you are happy with the lighting in your scene.

5. Finally, how to spawn light-sources:
a) Walk up to the object you want to attach the light-source to.
b) Press tilde (`) to open the console.
c) Select that object with the cursor. (Its ID will pop up at the top of the console window)
d) type: placeatme ID 1
>> Where ID is the FormID of the light-source you want to use.
>> The IDs are not case-sensitive so don't worry about capitalising the letters.
Example: placeatme 0003611f 1
e) Hit Enter and the light-source will magically appear.

6. When you are happy with the lighting of your home make another hard-save, back it up and continue playing like normal.

These are the light-sources I thought worked with this scene:

0003611f small cool (matches room)
000da628 small neutral
00075c32 small warm
00039eea med warm
0003b9b1 med bright neutral
0010cdc8 med white
00059b5f large neutral
000b15ee large warm

Want coloured lights?
0010d99e tiny blue-green FX
0008799c small blue-green
00045d7b small green

There is an extensive list of light-source objects on LoversLab, original post "??? What's the best light source in Skyrim?" by allsunday.

0010FDA1 : MagicVoiceDismay03
0010FDA0 : MagicVoiceDismay02
0010FD9F : MagicVoiceDismay01
0010FBF0 : MagicLightFrostSpear01
0010FBEC : MagicLightFireball02
0010F52E : BleakFallsSunlight01b
0010E15B : FarmExteriorLight01
0010D99E : FXLightGreenBlueGlow
0010CDC8 : MagicLightHealCircle01
001093AB : BoethiahBluePulseLight
00108D79 : MGFirePillarLightBlueShadow
00108D6E : SovngardeLightBounce
00106AD9 : MagicLightMagnusProjectile01
00106914 : DefaultLightBlue
00106910 : DefaultBlueBounce01NSDesat
00105305 : LoadScreenLightFill
00105303 : LoadScreenLightBack
00105300 : LoadScreenLightMain
0010389E : TwlightSepulcherPurpleBounceNSLight
0010389D : TwlightSepulcherPurpleShadLight
001037E4 : MQ206LightRedRim
001037D2 : EffigyOlafFXLight
00101CE7 : ThroatoftheWorldBouncedLight
0010092A : DefaultTorch02Spot
000FFF49 : MagicLightPoisionSprayProjectile
000FFF48 : MGFirePillarLightBlue
000FFF46 : MGFirePillarLightShadow
000F7CC2 : DefaultGreen01NS
000F7CC1 : DefaultViolet01NS
000F7CBF : DefaultBlueBounce01NS
000F7CBD : BlindCliffSpotlight01
000F7635 : TestInventoryLightRim
000F650E : MagicLightDA16SkullProjectile
000F650D : MagicLightDA16Skull
000F4851 : FarmInteriorSunLight01
000F3A89 : FXLightWhiteBasicShadow
000F252E : FXLightBlackBasic
000EE0C3 : BleakFallsWaterBounce01NS_MoveLessPriest
000D9DAD : MGEyeCollegeLight01
000D0E40 : SLightStreetStreet01
000CB626 : DefaultBlueBounceWater01NSDim
000CB3B0 : DefaultTorch01NS_FastSaturate
000C9F38 : LightTorchOutdoors
000C6595 : DwarvenOmniLight_NoMove
000C6527 : DefaultSunlight01Closer04
000C650C : DwarvenSunlightBounceAmb01NS
000C275D : MS06PotemaBanishLight
000C275B : MS06RitualLightEvil
000C275A : MS06WolfSkullCaveMainLight
000C1E2C : DA16FogEmmitanceLight
000C12F6 : DefaultCandleLight04Spot
000C1244 : IceBounce01NSBlue
000C10AD : SaarthalBallLight01NS
000C1095 : YngolMagicLight02NS
000C1094 : YngolMagicLight01NS
000B9402 : TestGrantIntLightSpotSunBlue
000B735D : SLightCandleStreet01
000A6E23 : SolitudeInnBlueDark01Pulse
0006C056 : SolitudeInnSpotlightDefaultShadow
0006C04E : SolitudeInnBlueDark01
000625E0 : SolitudeInnCandleDefaultShadow
000354ED : BleakFallsWaterBounce01NS_MoveLess
0001FD03 : MagicVoiceDragonRendProjectileLight
000838A6 : FarmInteriorShadowSunLight01
0008278A : WRLightFireStreet01
0003845F : UstengravSunlight
0003611F : SolitudeInnCandleDefault
00015610 : FrostmereCryptLight02NS
0001560F : FrostmereCryptLight01NS
000E7555 : MagicLightShockProjectile03
000E2969 : WRCandleLightBounceAmb01Hemi
000E259C : SolitudeInteriorLightSM
000E2175 : AzuraSuperBlue01
000E2174 : AzuraPureWhite01
000E2173 : AzuraWhite01
000E2172 : AzuraBlue01
000E2149 : IceBounce01NSSaturate
000E2044 : RannveigsTorch01NS_NoMove
000E203D : RannveigsTorch01NS
000E2019 : RannveigsTorch01
000E2018 : RannveigsTorch01NS_Fast
000DDF68 : dunMiddenMagicalLight
000DC20C : MagicLightFrostSpray01
000DB9DE : FalmerCityLight02NS
000DB9D5 : FalmerCityLight01NS
000DB9D2 : FalmerEpicMushroom01NS
000DA628 : MarkarthFireLight
000DA626 : MarkarthFireLightShad
000DA06D : SolitudeInteriorLighXtLG
000D8FBA : BlackreachWater02NS
000D8F71 : FalmerPurple01NS
000D7BD5 : MiddenRedEye01
000D4C29 : SolitudeInteriorLightBlueMD2
000D4C27 : SolitudeInnSunlightShadow
000D4887 : MagicLightFireballStorm01
000D4809 : WRWindowFillWarm
000D1947 : DefaultCandleLight01_DesatFXDark
000D1878 : BleakFallsSunlight01NPS
000D13E7 : MagicLightReanimate1
000CE016 : SolitudeInnLight02Md
000CD48D : WRChandlierFlickerShadow
000CD065 : SolitudeInnFirePlacesDefault
000CD016 : SolitudeInteriorLightBlueLG
000CC850 : SovngardeLightOutside
000CC84F : SovngardeShadowOmni
000CC84E : SovngardeLightBounceNS
000CB92C : WindhelmFireLightNS
000CB902 : WindhelmFireLight01
000C82C7 : SovngardeWarmLight
000C82C6 : SovngardeBlueLight
000C82AE : WRShadowOmni
000C8134 : IceTorch01NS_SaturateMoveLess
000C812D : IceBloodPool01NS
000C8126 : IceTorch01_Saturate
000C7735 : DefaultBlueBounceWater01NSDesat
000C65CA : SolitudeInnWindowtDefault
000C59DB : IceSunlightBounceAmb01Hemi
000C59DA : IceSunlightBounceAmb01
000C1D01 : DefaultTorch01NS_Saturate
000BBAE5 : WRFireLightNS
000B9BEE : WRFireplaceFill
000B9BE7 : WRCandleFlickerNS
000B9BE6 : WRCandlePulseShadow
000B9522 : WRWindowFill
000A9280 : SleepingTreeCampMagicWaterLight
000A2697 : IceTorch01NS_Saturate
0003C415 : IceCavern_SunlightSpot02
000195BC : IceBounce01NSDesat
0001952C : IceTorch01NSDesat
0001952B : IceTorch01NS_SuperFast
0001952A : IceTorch01NS_NoMove
00019529 : IceTorch01NS_FastDesat
00019528 : IceTorch01NS_Fast
00019527 : IceTorch01NS
00019526 : IceTorch01Desat
00019521 : IceTorch01_SuperFast
0001950F : IceTorch01_FastDesat
0001950E : IceTorch01_Fast
0001950D : IceTorch01
0001950C : IceSunlightBounceAmb01NS
0001950B : IceCandleLight01NSDesat
00019507 : IceCandleLight01NS
00019506 : IceCandleLight01_NoMove
00019500 : IceCandleLight01_MoveLess
000194F6 : IceCandleLight01_DesatMoveLess
000194F5 : IceCandleLight01_Desat
000194F4 : IceCandleLight01
000194F3 : IceBounce01NS
00018FED : SolitudeInnLight07_Desat
00018FEA : RiftenLight01ShadSpot_Desat
00018FE9 : RiftenLight01ShadNoFlicker_Desat
00018FE5 : RiftenLight01Shad_Desat
00018FE4 : RiftenLight01_Desat
00018FBF : NocturnalLight
000172C4 : DefaultSunlightHalfOmni01
00038A77 : DefaultTorch01NS_FastDesat
00035F62 : DefaultCandleLight01NSDesatNPS
000346CF : DefaultTorch01_FastDesat
00090007 : IchorLight
00079AB6 : DefaultCandleLight03Spot
00075489 : DefaultSunlight01Closer03
00075477 : BorderWallSmoke01
00075347 : MagicLightReanimateHand
0007531F : AAAGrantIntLightHurtBrightBounce
0007531E : TestGrantIntLightHurtBright
000691D2 : DefaultCandleLight01_DesatMoveLess
00068DEA : DefaultCandleLight02Spot
000668F2 : DefaultCandleLight01_Desat
0005EAE2 : DefaultSunlight01NS_NotPortalStrict
0005EAD6 : DefaultTorch01NS_NotPortalStrict
0005C777 : DefaultSunlight01Closer02
0005C70D : DefaultCandleLight01_MoveLess
0005C677 : DefaultCandleLight01_NoMove
000592D9 : MagicLightShockHandBig
00048C2C : BlackreachWater01NS
00045D7B : GreenPoisonGasLight
000411C7 : ForelhostSunlight01
00036B0D : DefaultTorch01_SuperFast
00036464 : DefaultTorch01_Fast
00036365 : DefaultSunlightBluerOmniNS
0003559C : DefaultTorch01NS_NoMove
0001FD9B : DefaultBlueBounceWater01NS_MoveLess
0001FCD8 : DwarvenOmni_ShadLightHalfOmni
0001F8C9 : DwarvenOmniLight_Desat_NoMove
0001F8B0 : DefaultBlueBounceWater01NS
0001F5B8 : DwarvenOmniLight_FlickerLess
000BCC9F : DefaultTorch01NS_SuperFast
000BCC9E : HelgenCandleLight01NS_Still
000BCC9D : DefaultTorch01NS_Fast
000BB937 : KorvanjundTorchNS
000BA421 : HelgenCandleLight01Spot
000BA420 : HelgenCandleLight01NS
000BA41F : HelgenCandleLight01
000B9F27 : FalmerBlueLightSuperSaturate01NS_NoPortal
000B9E83 : FalmerTorch01NS
000B9E82 : FalmerTorch01
000B9E2A : FalmerBlueLightSuperSaturate01NS
000B9E29 : FalmerBlueLightSuperSaturate01
000B9E28 : FalmerBlueLightBounce01NS
000B9E26 : FalmerBlueLight01NS
000B9E25 : FalmerBlueLight01
000B872E : KorvanjundSunlightOmni
000B7DE6 : DefaultSunlightBounceAmb01Hemi
000B7DE5 : DefaultSunlightBounceAmb01
000B7DBC : DefaultSunlight01Closer
000B79FA : MagicLightFrostBlizzard01
000B79AF : KorvanjundSunlightBounce
000B7475 : KorvanJundOrangeShadowOmni
000B7470 : KorvanjundSunlight
000B7293 : KorvanljundBlueOmni
000B6BCC : DefaultCandleLight01Spot
000B6466 : KorvanjundOrangeOmni
000B4257 : DA10GhostLights
000B348E : DBPostBounceLight01
000B3489 : BleakFallsWaterBounce01
000B3472 : DBPostBounceLight01NS
000B346D : DBCandlePost01NS
000B345B : DBFireLight01NS
000B345A : DBFireLight01
000B3405 : BleakFallsWaterBounce01NS_MoveMore
000B3404 : BleakFallsWaterBounce01NS
000B33F7 : BleakFallsCandleLight01_Flicker
000B33F2 : BleakFallsDraugrTorch01_HalfOmni
000B33F0 : BleakFallsDraugrTorch01NS_MoveLess
000B33EA : BlackDoorLightInterior01DesatNS
000B3214 : RiftenLight01ShadNoFlicker
000B2FB4 : RiftenLight01NoFlicker
000B2FAF : RiftenLight01ShadSpot

Alternatively you can learn to mod and use the editor to edit the scene. <(0-0)>

Follow the fire!